/usr/share/gap/pkg/ctbllib/gap4/ctadmin.tbd is in gap-character-tables 1r1p3-5.
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The actual contents of the file can be viewed below.
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##
#W ctadmin.tbd GAP character table library Thomas Breuer
#W Ute Schiffer
##
#H @(#)$Id: ctadmin.tbd,v 4.59 2004/02/18 17:44:54 gap Exp $
##
#Y Copyright (C) 1997, Lehrstuhl D fuer Mathematik, RWTH Aachen, Germany
##
## This file contains the declaration part of the data of the {\GAP}
## character table library that is not automatically produced from the
## library files.
##
## 0. Global variables to handle the table library.
## 1. Representations of library tables
## 2. Functions used in the library files
## 3. Functions to construct library tables
## 4. Functions used as `construction' component of library tables
## 5. Selection functions for the table library
## 6. Functions to produce tables in library format
##
Revision.( "ctbllib/gap4/ctadmin_tbd" ) :=
"@(#)$Id: ctadmin.tbd,v 4.59 2004/02/18 17:44:54 gap Exp $";
#############################################################################
##
#1
## The data files of the {\GAP} Character Table Library
## reside in the `data' directory of the package `ctbllib'.
##
## The filenames start with `ct' (for ``character table''),
## followed by either `o' (for ``ordinary''), `b' (for ``Brauer''),
## or `g' (for ``generic''),
## then a description of the contents (up to $5$ characters, e.g., `alter'
## for the tables of alternating and related groups),
## and the suffix `.tbl'.
##
## The file `ctb<descr>.tbl' contains the known Brauer tables
## corresponding to the ordinary tables in the file `cto<descr>.tbl'.
##
## Each data file of the table library is supposed to consist of
## \beginlist
## \item{1.}
## comment lines, starting with `#' in the first column,
## \item{2.}
## assignments to `ALN' (short for ``add library name'',
## see~"NotifyNameOfCharacterTable")
## and to a component of `Revision', at the beginning of the file,
## for example in the file with name `ctoalter.tbl' a value is assigned
## to `Revision.ctoalter_tbl',
## \item{3.}
## assignments to `ALN' and to a component of `LIBTABLE.LOADSTATUS',
## at the end of the file, and
## \item{4.}
## function calls of the form
## `SET_TABLEFILENAME( <filename> )',
## `MBT( <name>, <data> )' (``make Brauer table''),
## `MOT( <name>, <data> )' (``make ordinary table''),
## `ALF( <from>, <to>, <map> )',
## `ALF( <from>, <to>, <map>, <textlines> )' (``add library fusion''),
## `ALN( <name>, <listofnames> )', and
## `ARC( <name>, <component>, <compdata> )' (``add record component'').
##
## Here <filename> must be a string corresponding to the filename but
## without suffix, for example `\"ctoalter\"' if the file has the name
## `ctoalter.tbl';
## <name> must be the identifier value of the ordinary character table
## corresponding to the table to which the command refers;
## <data> must be a comma separated sequence of {\GAP} objects;
## <from> and <to> must be identifier values of ordinary character
## tables,
## <map> a list of positive itegers,
## <textlines> and <listofnames> lists list of strings,
## <component> a string, and
## <compdata> any {\GAP} object.
##
## `MOT', `ALF', `ALN', and `ARC' occur only in files containing
## ordinary character tables,
## and `MBT' occurs only in files containing Brauer tables.
## \endlist
## Besides the above calls, the data in files containing ordinary and Brauer
## tables may contain only the following {\GAP} functions.
## (Files containing generic character tables may contain calls to
## arbitrary {\GAP} library functions.)
##
## `ACM',
## `Concatenation',
## `E',
## `EvalChars',
## `GALOIS',
## `Length',
## `NotifyCharTableName',
## `ShallowCopy',
## `TENSOR', and
## `TransposedMat'.
##
## The `awk' script `maketbl' in the `etc' directory of the `ctbllib'
## package expects the file format described above,
## and to some extent this format is checked by this script.
##
## The function calls may be continued over several lines of a file.
## A semicolon is assumed to be the last character in its line
## if and only if it terminates a function call.
##
## Names of character tables are strings
## (see Chapter~"ref:Strings and Characters" in the {\GAP} Reference Manual),
## i.e., they are enclosed in double quotes;
## strings in table library files must not be split over several lines,
## because otherwise the `awk' script may get confused.
## Additionally, no character table name is allowed to contain double
## quotes.
##
## {\GAP}'s knowledge about the ordinary tables in the table library
## is given by the file `ctprimar.tbl' (the ``primary file'' of the
## table library).
## This file can be produced from the library files by the script `maketbl'
## in the `etc' directory of the `ctbllib' package.
## The information is stored in the global variable `LIBLIST',
## which is a record with the following components.
## \beginitems
## `firstnames' &
## the list of `Identifier' (see~"ref:Identifier!for character tables"
## in the {\GAP} Reference Manual) values of the ordinary tables,
##
## `files' &
## the list of filenames containing the data of ordinary tables,
##
## `filenames' &
## a list of positive integers, value $j$ at position $i$ means that the
## table whose identifier is the $i$--th in the `firstnames' list is
## contained in the $j$-th file of the `files' component,
##
## `fusionsource' &
## a list containing at position $i$ the list of names of tables that
## store a fusion into the table whose identifier is the $i$--th in the
## `firstnames' list,
##
## `allnames' &
## a list of all admissible names of ordinary library tables,
##
## `position' &
## a list that stores at position $i$ the position in `firstnames'
## of the identifier of the table with the $i$--th admissible name in
## `allnames',
##
## `projections' &
## a list of triples $[ <name>, <factname>, <map> ]$
## describing a factor fusion <map> from the table with identifier
## <name> to the table with identifier <factname>
## (this is used to construct the table of <name> using the data of
## the table of <factname>),
##
## `simpleinfo' &
## a list of triples $[ <m>, <name>, <a> ]$ describing the tables of
## simple groups in the library; <name> is the identifier of the table,
## `<m>.<name>' and `<name>.<a>' are admissible names for its
## Schur multiplier and automorphism group, respectively,
##
## `sporadicSimple' &
## a list of identifiers of the tables of the $26$ sporadic simple
## groups, and
##
## `GENERIC' &
## a record with information about generic tables
## (see~"Generic Character Tables").
## \enditems
##
## There are three different ways how the table data can be stored in the
## file.
##
## *Full ordinary tables* are encoded by a call to the function `MOT',
## where the arguments correspond to the relevant attribute values;
## each fusion into another library table is added by a call to `ALF',
## values to be stored in components of the table object are added with
## `ARC', and admissible names are notified with `ALN'.
## The argument of `MOT' that encodes the irreducible characters is
## abbreviated as follows.
## For each subset of characters that differ just by multiplication with a
## linear character or by Galois conjugacy, only the first one is given by
## its values, the others are replaced by
## `[TENSOR,[<i>,<j>]]' (which means that the character is the tensor
## product of the <i>-th and the <j>-th character in the list)
## or `[GALOIS,[<i>,<j>]]' (which means that the character is obtained from
## the <i>-th character by applying `GaloisCyc( ., <j> )' to it.
##
## *Brauer tables* are stored relative to the corresponding ordinary tables;
## attribute values that can be got by restriction from the ordinary table
## to $p$--regular classes are not stored,
## and instead of the irreducible characters the files contain (inverses of)
## decomposition matrices or Brauer trees for the blocks of nonzero defects.
##
## *Ordinary construction tables* have the attribute
## `ConstructionInfoCharacterTable' (see~"ConstructionInfoCharacterTable")
## set, with value a list that contains the name of the construction
## function used and the arguments for a call to this function;
## The function call is performed by `CharacterTable' when the table is
## constructed (*not* when the file containing the table is read).
## The aim of this mechanism is to store structured character tables such as
## tables of direct products and tables of central extensions of other
## tables in a compact way.
##
#############################################################################
##
## 0. Global variables to handle the table library.
##
#############################################################################
##
#V LIBTABLE
##
## is a record with the components
## \beginitems
## `LOADSTATUS' &
## a record whose components are names of files in the table library,
## with value one of `\"loaded\"', `\"unloaded\"', `\"userloaded\"',
##
## `TABLEFILENAME' &
## the name of the file that is currently read
## (is set by `SET_TABLEFILENAME'),
##
## `unload' &
## a Boolean, only one file with ordinary character tables plus perhaps
## the corresponding file with Brauer tables is kept in memory if the
## value is `true' (which is the default),
##
## `clmelab' &
## the list for Clifford matrices of extensions by elementary abelian
## normal subgroups
##
## `clmexsp' &
## the list for Clifford matrices of extensions by extraspecial normal
## subgroups
## \enditems
## Additionally the filenames of loaded and userloaded files occur as
## components, with values the lists of data stored in the files.
##
BindGlobal( "LIBTABLE", rec(
LOADSTATUS := rec(),
TABLEFILENAME := "",
unload := true,
clmelab := [],
clmexsp := []
) );
#############################################################################
##
## OrderCyc( <cyc> )
##
## This is needed for backward compatibility.
## A call of `OrderCyc' (with one argument) occurs in `ctgeneri.tbl',
## it cannot be replaced by `Order' because {\GAP}~3 does not accept it.
##
DeclareSynonym( "OrderCyc", Order );
#############################################################################
##
## 1. Representations of library tables
##
## All these are in the library now, because the library accesses these.
#############################################################################
##
#F SET_TABLEFILENAME( <filename> )
##
DeclareGlobalFunction( "SET_TABLEFILENAME" );
#############################################################################
##
## 2. Functions used in the library files
##
#############################################################################
##
#F GALOIS( <chars>, <list> )
#F TENSOR( <chars>, <list> )
##
## are global variables used to store the library tables in compressed form.
##
## The entry `[GALOIS,[<i>,<j>]]' in the `irreducibles' or `projectives'
## component of a library table means the <j>-th Galois conjugate of
## the <i>-th character.
##
## The entry `[TENSOR,[<i>,<j>]]' in the `irreducibles' or `projectives'
## component of a library table means the tensor product of the <i>-th
## and the <j>-th character.
##
#F EvalChars( <chars> )
##
## replaces all entries of the form `[<func>,<list>]' in the list <chars>
## by the result `<func>( <chars>, <list> )'.
##
DeclareGlobalFunction( "GALOIS" );
DeclareGlobalFunction( "TENSOR" );
DeclareGlobalFunction( "EvalChars" );
#############################################################################
##
#F ALF( <from>, <to>, <map>[, <text>, <spec>] ) . add library table fusions
##
## `ALF' stores the fusion map <map> between the ordinary character tables
## with identifier strings <from> and <to> in the record encoding the table
## with identifier <from>.
## If the string <text> is given then it is added as `text' component of the
## fusion.
## If the argument <spec> is given then it is added as `specification'
## component of the fusion.
##
## `ALF' changes the global list `LIBLIST.fusionsource'.
##
## Note that the `ALF' statement should be placed in the file containing the
## data for the table with identifier <from>.
##
DeclareGlobalFunction( "ALF" );
#############################################################################
##
#F ACM( <spec>, <dim>, <val> )
## adds a Clifford matrix to the library.
## <spec> is one of the strings "elab", "exsp".
## <dim> is the dimension of the Clifford matrix,
## <val> is the Clifford matrix itself.
##
#F ARC( <name>, <comp>, <val> )
## adds the record component <comp> with value <val> to the table record
## with name <name>.
##
## These functions are used in the library table files,
## so they assume that it is not necessary to read such a file before the
## data can be stored.
##
DeclareGlobalFunction( "ACM" );
DeclareGlobalFunction( "ARC" );
#############################################################################
##
#F NotifyNameOfCharacterTable( <firstname>, <newnames> )
#F ALN( <firstname>, <newnames> )
##
## notifies the strings in the list <newnames> as new admissible names for
## the library table with `Identifier' value <firstname>,
## see~"ref:Identifier!for character tables" in the {\GAP} Reference Manual.
## If there is already another library table for which some of these names
## are admissible then an error is signaled.
##
## `NotifyNameOfCharacterTable' modifies the global variable `LIBLIST'.
##
## `ALN' is a shorthand for `NotifyNameOfCharacterTable'.
## In those library files for which the `maketbl' script has produced the
## necessary information for `LIBLIST', `ALN' is set to `Ignore'
## in the beginning and back to `NotifyNameOfCharacterTable' in the end.
##
DeclareGlobalFunction( "NotifyNameOfCharacterTable" );
ALN:= NotifyNameOfCharacterTable; # We do not use `DeclareSynonym' here
# because assignments are made to `ALN'
# in data files.
#T because of the table files ...
NotifyCharTableName := NotifyNameOfCharacterTable;
#############################################################################
##
#F NotifyCharacterTable( <firstname>, <filename>, <othernames> )
##
## notifies a new ordinary table to the library.
## This table has `Identifier' value <firstname>,
## it is contained (in library format, see~"PrintToLib") in the file with
## name <filename> (without suffix `.tbl'),
## and the names contained in the list <othernames> are admissible for it.
##
## If the initial part of <filename> is one of `~/', `/' or `./' then it is
## interpreted as an *absolute* path.
## Otherwise it is interpreted *relative* to the `data' directory of the
## `ctbllib' package.
##
## `NotifyCharacterTable' modifies the global variable `LIBLIST' for the
## current {\GAP} session,
## after having checked that there is no other library table yet with an
## admissible name equal to <firstname> or contained in <othernames>.
##
DeclareGlobalFunction( "NotifyCharacterTable" );
#############################################################################
##
#F NotifyCharTable( <firstname>, <filename>, <othernames> )
##
## for compatibility with {\GAP}~3
##
DeclareSynonym( "NotifyCharTable", NotifyCharacterTable );
#############################################################################
##
#F MBT( <arg> )
##
## The library format of Brauer tables is a call to the function
## `MBT', with the following arguments.
##
## 1. identifier of the table
## 2. field characteristic
## 3. text (list of lines)
## 4. block
## 5. defect
## 6. basic set
## 7. Brauer tree information
## 8. inverses of decomposition matrices restricted to basic sets
## 9. blocks of proper factor groups
## 10. list of generators for the group of table automorphisms
## 11. 2nd indicator (in characteristic 2 only)
## 12. (optional) record with additional components
##
## `MBT' constructs a record and stores it in the record
## `LIBTABLE.TABLEFILENAME'.
##
DeclareGlobalFunction( "MBT" );
#############################################################################
##
#F MOT( <arg> )
##
## The library format of ordinary character tables is a call to the function
## `MOT', with the following arguments.
##
## 1. identifier of the table
## 2. text (list of lines)
## 3. list of centralizer orders
## 4. list of power maps
## 5. list of irreducibles
## 6. list of generators for the group of table automorphisms
## 7. (optional) construction of the table
##
## Each fusion is added by `ALF', any other component of the table must be
## added individually via `ARC( <identifier>, <compname>, <compval> )'.
##
## `MOT' constructs a preliminary table record,
## and puts it into the record `LIBTABLE.TABLEFILENAME'.
## The `namesOfFusionSources' and `projections' are dealt with when the
## table is constructed by `CharacterTableFromLibrary'.
## Admissible names are notified by `ALN( <name>, <othernames> )'.
##
DeclareGlobalFunction( "MOT" );
#############################################################################
##
#V GEN_Q_P
##
## for prime powers <q>, at position <q> the unique prime divisor of <q>
##
#F PrimeBase( <q> ) . . . . . . . . . . . . . . unique prime divisor of <q>
##
## If <q> is a prime power, `PrimeBase' computes the prime of which it is
## a power. For the sake of speed, the results are stored
## in the global list `GEN_Q_P'.
##
DeclareGlobalVariable( "GEN_Q_P",
"list where the prime <p> is stored at position <p>^<n>, if bound" );
DeclareGlobalFunction( "PrimeBase" );
#############################################################################
##
## 3. Functions to construct library tables
##
#############################################################################
##
#F LibInfoCharacterTable( <tblname> )
##
## is a record with components
## \beginitems
## `firstName' &
## the `Identifier' value (see~"ref:Identifier!for character tables"
## in the {\GAP} Reference Manual) of the library table
## for which <tblname> is an admissible name, and
##
## `fileName' &
## the name of the file in which the table data is stored.
## \enditems
## If no such table exists in the {\GAP} library then `fail' is returned.
##
## If <tblname> contains the substring `\"mod\"' then it is regarded as the
## name of a Brauer table.
## In this case the result is computed from that for the corresponding
## ordinary table and the characteristic.
## So if the ordinary table exists then the result is a record although
## the Brauer table in question need not be contained in the {\GAP} library.
##
DeclareGlobalFunction( "LibInfoCharacterTable" );
#############################################################################
##
#F LibraryTables( <filename> )
##
## is the list of data obtained on reading the file `<filename>.tbl'.
## If the initial part of <filename> is one of `~/', `/' or `./' then the
## file with this name is read; otherwise the name is interpreted relative
## to the `data' directory of the `ctbllib' package.
##
DeclareGlobalFunction( "LibraryTables" );
#############################################################################
##
## We replace the library function `CharacterTableFromLibrary' that just
## issues a warning about nonavailability of the Character Table Library.
##
MakeReadWriteGlobal( "CharacterTableFromLibrary" );
UNBIND_GLOBAL( "CharacterTableFromLibrary" );
#############################################################################
##
#F CharacterTableFromLibrary( <tblname> )
#F CharacterTableFromLibrary( <series>, <param1>[, <param2>] )
##
## If the only argument is a string <tblname> and if this is an admissible
## name (see below) of a library character table then
## `CharacterTableFromLibrary' returns this library table, otherwise `fail'.
##
## If `CharacterTableFromLibrary' is called with more than one argument
## then the first must be a string <series> specifying a series of groups
## which is implemented via a generic character table,
## for example `\"Symmetric\"' for symmetric groups;
## the remaining arguments specialise then the desired member of the series
## (see~"Generic Character Tables" for a list of available generic tables).
## If no generic table with name <series> is available or if the parameters
## are not admissible then `CharacterTableFromLibrary' returns `fail'.
##
## A call of `CharacterTableFromLibrary' may cause to read some library
## files and to construct the table object from the data stored in these
## files,
## so fetching a library table may take more time than on expects.
##
## `CharacterTableFromLibrary' is called by `CharacterTable' if the first
## argument is a string, so one may also call `CharacterTable'.
##
## Admissible names for the *ordinary character table* $t$ of the group $G$
## are
## \beginlist
## \item{-}
## an {\ATLAS} like name if $t$ is an {\ATLAS} table
## (see~"ATLAS Tables"), for example
## `\"M22\"' for the table of the Mathieu group $M_{22}$,
## `\"L2(13).2\"' for $L_2(13):2$, and
## `\"12_1.U4(3).2_1\"' for $12_1\.U_4(3)\.2_1$,
##
## (The difference to the name printed in the {\ATLAS} is that
## subscripts and superscripts are omitted except if they are used to
## qualify integer values,
## and double dots are replaced by a single dot.)
## \item{-}
## the names that were admissible for tables of $G$ in {\sf CAS}
## if the {\sf CAS} table library contained a table of $G$,
## for example `sl42' for the table of the alternating group $A_8$,
##
## (But note that the {\GAP} table may be different from that in
## {\sf CAS}, see~"CAS Tables".)
## \item{-}
## some ``relative'' names, as follows.
##
## If $G$ is the <n>--th maximal subgroup (in decreasing group order)
## of a group whose library table $s$ is available in {\GAP} and stores
## the `Maxes' value (see~"Maxes"),
## and if <name> is an admissible name for $s$
## then `<name>M<n>' is admissible for $t$.
## For example, the name `\"J3M2\"' can be used to access the second
## maximal subgroup of the sporadic simple Janko group $J_3$
## which has the admissible name `J3'.
##
## If $G$ is a nontrivial Sylow $p$ normalizer in a sporadic simple
## group with admissible name <name>,
## --where nontrivial means that $G$ is not isomorphic to a subgroup of
## $p:(p-1)$--
## then `<name>N<p>' is an admissible name of $t$.
## For example, the name `\"J4N11\"' can be used to access the table of
## the Sylow $11$ normalizer in the sporadic simple Janko group $J_4$.
##
## In a few cases, the table of the Sylow $p$ subgroup of $G$ is
## accessible via the name `<name>Syl<p>' where <name> is an admissible
## name of the table of $G$.
## For example, `\"A11Syl2\"' is an admissible name for the table of the
## Sylow $2$ subgroup of the alternating group $A_{11}$.
##
## In a few cases, the table of an element centralizer in $G$ is
## accessible via the name `<name>C<cl>'
## where <name> is an admissible name of the table of $G$.
## For example, `\"M11C2\"' is an admissible name for the table of an
## involution centralizer in the Mathieu group $M_{11}$.
## \endlist
##
## The recommended way to access *Brauer tables* from the library is via the
## `mod' operator from the ordinary table and the desired characteristic
## (see~"ref:BrauerTable" and "ref:Operators for Character Tables"
## in the {\GAP} Reference Manual),
## so it is not necessary to define admissible names of Brauer tables.
##
## A *generic character table* (see~"Generic Character Tables") is
## accessible only by the name given by its `Identifier' value
## (see~"ref:Identifier!for character tables"
## in the {\GAP} Reference Manual).
##
## Case is not significant for character table names.
## For example, both `\"suzm3\"' and `\"SuzM3\"' are admissible names for
## the third maximal subgroup of the sporadic simple Suzuki group.
##
DeclareGlobalFunction( "CharacterTableFromLibrary" );
#############################################################################
##
#F PartsBrauerTableName( <modname> )
##
## is a record with components
## `ordname'
## substring up to the occurrence of `mod' in <modname>,
## `prime'
## the integer of the string after `mod'.
##
DeclareGlobalFunction( "PartsBrauerTableName" );
#############################################################################
##
#F BasicSetBrauerTree( <brauertree> )
##
## returns a basic set of the Brauer tree <brauertree>.
## *Note* that this is a list of positions relative to the block, so it is
## not compatible with the `basicset' components of blocks in Brauer tables.
##
DeclareGlobalFunction( "BasicSetBrauerTree" );
#############################################################################
##
#F DecMatBrauerTree( <brauertree> )
##
## In the {\GAP} table library, a Brauer tree <brauertree> is a list where
## `<brauertree>[i]' contains the positions of `1' in the `i'-th column
## of the decomposition matrix of the corresponding block.
## So `<brauertree>[i]' has length 2 or 3 (in the case of exceptional
## characters).
##
## `DecMatBrauerTree' returns the decomposition matrix of the block with
## given Brauer tree.
##
DeclareGlobalFunction( "DecMatBrauerTree" );
#############################################################################
##
#F BrauerTree( <decmat> )
##
## returns the Brauer tree of the decomposition matrix <decmat>, if exists,
## and `fail' otherwise.
##
DeclareGlobalFunction( "BrauerTree" );
#############################################################################
##
#F BrauerTableFromLibrary( <ordtbl>, <p> )
##
## is the <p>-modular Brauer table of the ordinary library table <ordtbl>.
##
DeclareGlobalFunction( "BrauerTableFromLibrary" );
#############################################################################
##
#F CharacterTableSpecialized( <generic_table>, <q> ) . . . . specialise <q>
##
## For a record <generic_table> representing a generic character table,
## and a parameter value <q>,
## `CharacterTableSpecialized' returns a character table object computed by
## evaluating <generic_table> at <q>.
##
DeclareGlobalFunction( "CharacterTableSpecialized" );
#############################################################################
##
#F CharTableSpecialized( <gentbl>, <param> )
##
## for compatibility with {\GAP}~3
##
DeclareSynonym( "CharTableSpecialized", CharacterTableSpecialized );
#############################################################################
##
## 4. Functions used as `construction' component of library tables
##
## Note that in all construction functions, the table under construction is
## a plain record, *not* a table object.
##
#############################################################################
##
#F TransferComponentsToLibraryTableRecord( <t>, <tbl> )
##
## <t> must be a library character table, and <tbl> a record that will be
## converted to a library character table later.
## `TransferComponentsToLibraryTableRecord' transfers all those values
## from <t> to <tbl> that are described by `SupportedOrdinaryTableInfo'
## and `SupportedLibraryTableComponents'.
##
DeclareGlobalFunction( "TransferComponentsToLibraryTableRecord" );
#############################################################################
##
#F InducedLibraryCharacters( <subtbl>, <tblrec>, <chars>, <fusionmap> )
##
## is the list of class function values lists
##
DeclareGlobalFunction( "InducedLibraryCharacters" );
#############################################################################
##
#F UnpackedCll( <cll> )
##
## is a record with the components `mat', `inertiagrps', `fusionclasses',
## and perhaps `libname'.
## These are the only components used in the construction of library
## character tables encoded by Clifford matrices.
##
## The meaning of <cll> is the same as in `CllToClf'.
##
DeclareGlobalFunction( "UnpackedCll" );
#############################################################################
##
#F CllToClf( <tbl>, <cll> )
##
## is a Clifford matrix for the table <tbl>.
## It is constructed from the list <cll> that contains
## the following entries.
## 1. list of indices of inertia factors
## 2. list of classes fusing in the factor group
## 3. identification of the matrix,
## either unbound (then the matrix has dimension <= 2)
## or a list containing
## a. string `"elab"' or `"exsp"'
## b. size of the Clifford matrix
## c. index in the library file
## d. (optional) necessary permutation of columns
## or a list containing
## a. the Clifford matrix itself and
## b. the column weights.
## 4. (case `"exsp"') a list with items of record `splitinfos':
## a. classindex
## b. p
## c. numclasses
## d. root
##
DeclareGlobalFunction( "CllToClf" );
#############################################################################
##
## 5. Selection functions for the table library
##
#############################################################################
##
#F CompleteGroup()
##
## dummy function for selection function
##
DeclareGlobalFunction( "CompleteGroup" );
#############################################################################
##
#F OfThose()
##
## dummy function for selection function
##
DeclareGlobalFunction( "OfThose" );
#############################################################################
##
#V FingerprintOfCharacterTableGlobals
##
## a list of lists of names of functions
#T admit extensions by users
#T check that the values are valid
#T (`InstallFingerprintFunctionOfCharacterTable')
##
DeclareGlobalVariable( "FingerprintOfCharacterTableGlobals" );
InstallFlushableValue( FingerprintOfCharacterTableGlobals,
[ [ "Size" ],
[ "NrConjugacyClasses" ],
[ "IsSimpleCharacterTable" ],
[ "OrdersClassRepresentatives", "Collected" ],
[ "SizesCentralizers", "Collected" ],
] );
#############################################################################
##
#A FingerprintOfCharacterTable( <tbl> )
##
## a record whose components are ...
##
DeclareAttribute( "FingerprintOfCharacterTable", IsOrdinaryTable );
InstallMethod( FingerprintOfCharacterTable,
[ IsOrdinaryTable ],
function( tbl )
local result, list, val, name;
result:= rec();
for list in FingerprintOfCharacterTableGlobals do
val:= tbl;
for name in list do
val:= ValueGlobal( name )( val );
od;
result.( String( list ) ):= val;
od;
return result;
end );
#############################################################################
##
#F AllCharacterTableNames( [<func>, <val>, ... ] )
#F AllCharacterTableNames( <func>, <val>, ...[, OfThose, <func>] )
##
## Similar to group libraries (see Chapter~"ref:Group Libraries" in the
## {\GAP} Reference Manual),
## the {\GAP} character table library can be used to search for ordinary
## character tables with prescribed properties.
##
## A specific library table can be selected by an admissible name
## (see~"CharacterTableFromLibrary").
##
## The selection function for character tables from the {\GAP} Character
## Table Library that have certain abstract properties is
## `AllCharacterTableNames'.
## Contrary to the situation in the case of group libraries,
## the selection function returns a list not of library character tables
## but of their names;
## using `CharacterTable' one can then access the tables themselves.
##
## `AllCharacterTableNames' takes an arbitrary even number of arguments.
## The argument at each odd position must be a function, and
## the argument at the subsequent even position must be a value that this
## function must return when called for the character table in question,
## in order to have the name of the table included in the selection,
## or a list of such values.
## For example,
## \beginexample
## gap> names:= AllCharacterTableNames();;
## \endexample
## returns a list containing one admissible name of each ordinary character
## table in the {\GAP} library, and
## \beginexample
## gap> simpnames:= AllCharacterTableNames( IsSimple, true );;
## gap> AllCharacterTableNames( IsSimple, true, Size, [ 1 .. 100 ] );
## [ "A5" ]
## \endexample
## return lists containing an admissible name of each ordinary character
## table in the {\GAP} library whose groups are simple or are simple and
## have order at most $100$, respectively.
##
## For the sake of efficiency,
## the arguments `IsSimple' and `IsSporadicSimple' followed by `true' are
## handled in a special way, {\GAP} need not read all files of the table
## library in these cases in order to find the desired names.
##
## If the function `OfThose' is an argument at an odd position then the
## following argument <func> must be a function that takes a character table
## and returns a name of a character table or a list of names;
## this is interpreted as replacement of the names computed up to this
## position by the union of names returned by <func>.
## For example, <func> may be `Maxes' (see~"Maxes") or
## `NamesOfFusionSources' (see~"ref:NamesOfFusionSources" in the {\GAP}
## Reference Manual).
## \beginexample
## gap> maxesnames:= AllCharacterTableNames( IsSporadicSimple, true,
## > HasMaxes, true,
## > OfThose, Maxes );;
## \endexample
## returns the union of names of ordinary tables of those maximal subgroups
## of sporadic simple groups that are contained in the table library in the
## sense that the attribute `Maxes' is set.
##
## For the sake of efficiency, `OfThose' followed by one of the arguments
## `AutomorphismGroup', `SchurCover', `CompleteGroup' is handled in a
## special way.
##
DeclareGlobalFunction( "AllCharacterTableNames" );
#############################################################################
##
#F OneCharacterTableName( {<func>, <val>} )
#F OneCharacterTableName( <func>, <val>, ...{, OfThose, <func>} )
##
## The example function for character tables from the {\GAP} Character
## Table Library that have certain abstract properties is
## `OneCharacterTableName'.
## It is analogous to the selection function `AllCharacterTableNames'
## (see~"AllCharacterTableNames"), the difference is that it returns one
## `Identifier' value of a character table with the properties in question
## instead of the list of all such values.
## If no table with the required properties is contained in the {\GAP}
## Character Table Library then `fail' is returned.
## \beginexample
## gap> OneCharacterTableName( IsSimple, true, Size, 60 );
## "A5"
## gap> OneCharacterTableName( IsSimple, true, Size, 20 );
## fail
## \endexample
##
DeclareGlobalFunction( "OneCharacterTableName" );
#############################################################################
##
#F AllCharTableNames( ... )
##
## for compatibility with {\GAP}~3
##
DeclareSynonym( "AllCharTableNames", AllCharacterTableNames );
#############################################################################
##
#F CTblLibSetUnload( <value> )
##
## If <value> is `false' then the call to `CTblLibSetUnload' has the effect
## that data files from the {\GAP} Character TableLibrary are read only once
## in the current session.
## By default, the contents of only one data file is kept in memory,
## in order to keep the space small.
## This behaviour can be achieved also by calling `CTblLibSetUnload' with
## `true'.
##
DeclareGlobalFunction( "CTblLibSetUnload" );
#############################################################################
##
## 6. Functions to produce tables in library format
##
#############################################################################
##
#F ShrinkClifford( <tbl> )
##
## shrinks the `cliffordTable' component.
## The Clifford records are changed to library format using `ClfToCll'.
## In the library format, only the component `ident' of the inertia factor
## groups are stored.
##
DeclareGlobalFunction( "ShrinkClifford" );
#############################################################################
##
#F TextString( <text> )
##
## returns a string that is printed as
##
## [
## "<line_1>\n",
## "<line_1>\n",
## ...
## "<line_n>"
## ]
##
## where <line_i> is the <i>-th line of the output of `Print( <text> )',
## except that the doublequotes are escaped.
##
## *Note* that the `]' is the last output character.
##
DeclareGlobalFunction( "TextString" );
#############################################################################
##
#F BlanklessPrintTo( <stream>, <obj> )
##
## appends <obj> to the output stream <stream>,
## thereby trying to avoid unnecessary blanks.
## For the subobjects of <obj>, the function `PrintTo' is used.
## (So the subobjects are appended only if <stream> is of the appropriate
## type, see~"PrintTo".)
##
## If <obj> is a record then the component `text' and strings in an `irr'
## list are *not* treated in a special way!
##
## This function is used by the libraries of character tables and of tables
## of marks.
##
DeclareGlobalFunction( "BlanklessPrintTo" );
#T better use WriteAll?
#############################################################################
##
#F ShrinkChars( <chars> )
##
## returns the list corresponding to the list <chars> where
##
## each `<chars>[<k>]' that is the tensor product of `<chars>[<i>]'
## and a linear character `<chars>[j]' with $i, j \leq k$ is replaced by
## the string `\"[TENSOR,[<i>,<j>]]\"', and
##
## each `<chars>[<k>]' that is the <j>-th Galois conjugate of `<chars>[<i>]'
## with $i \leq k$ is replaced by the string `\"[GALOIS,[<i>,<j>]]\"'.
##
## This function is used by `PrintToLib'.
##
DeclareGlobalFunction( "ShrinkChars" );
#############################################################################
##
#F ClfToCll( <clf> )
##
## is a list encoding the information in the Clifford matrix record <clf>.
## <clf> must contain the components `mat', `inertiagrps', `fusionclasses'.
##
## See `CllToClf' for the meaning of the entries.
##
DeclareGlobalFunction( "ClfToCll" );
#T up to now no function is installed
#############################################################################
##
#F LibraryFusion( <name>, <fus> )
##
## For a string <name> that is an `Identifier' value
## (see~"ref:Identifier!for character tables" in the {\GAP} Reference
## Manual) of an ordinary character table in the {\GAP} library,
## and a record <fus> with the components
## `name' (the identifier of the destination table, or this table itself),
## `map' (the fusion map, a list of image positions),
## and optionally `text' (a string containing information about the fusion)
## and `specification' (a string or an integer),
## `LibraryFusion' returns a string whose printed value can be used to add
## the fusion in question to the library file containing the data for the
## table with identifier <name>.
##
## <name> may also be a character table, in this case its `Identifier' value
## is used as string.
##
DeclareGlobalFunction( "LibraryFusion" );
#############################################################################
##
#F LibraryFusionTblToTom( <name>, <fus> )
##
## For a string <name> that is an `Identifier' value
## (see~"ref:Identifier!for character tables" in the {\GAP} Reference
## Manual) of an ordinary character table in the {\GAP} library,
## and a record <fus> with components `name' (the identifier of the
## destination table of marks), `map' (the fusion map, a list of image
## positions), and optionally `text' (a string containing information about
## the fusion), `LibraryFusionTblToTom' returns a string whose printed value
## can be used to add the fusion in question to the character table library
## file containing the data for the table with identifier <name>.
##
## <name> may also be a character table, in this case its `Identifier' value
## is used as string.
##
DeclareGlobalFunction( "LibraryFusionTblToTom" );
#############################################################################
##
#F PrintToLib( <file>, <tbl> )
##
## prints the (ordinary or Brauer) character table <tbl> in library format
## to the file `<file>.tbl' or <file>
## (if this has already the suffix `.tbl'), respectively.
##
## If <tbl> is an ordinary table then the value of the attribute
## `NamesOfFusionSources' is ignored by `PrintToLib',
## since for library tables this information is extracted from the source
## files by the `maketbl' script.
##
DeclareGlobalFunction( "PrintToLib" );
#############################################################################
##
#F PrintClmsToLib( <file>, <clms> )
##
## prints the Clifford matrices in library format in a list on the file
## <file> which are not yet in the Clifford matrix library or in this list.
##
## <clms> must be a Clifford table or a list of Clifford records.
## In case of splitting, each Clifford record must contain `splitinfos'.
##
DeclareGlobalFunction( "PrintClmsToLib" );
#T up to now no function is installed
#############################################################################
##
#F OrbitsResidueClass( <pq>, <set> )
##
## is used in the generic character table of the groups $p \colon q$.
## <pq> must be a list of length $2$ or $3$, the first entry being $p$,
## the second being $q$, and the third (if bound) being the residue $k$
## (modulo $p$) that forms orbits of length $q$ each on the nonzero
## residues modulo $p$.
## <set> is the set of points to act on.
##
DeclareGlobalFunction( "OrbitsResidueClass" );
#############################################################################
##
#A CASInfo( <tbl> )
##
## Let <tbl> be an ordinary character table <tbl> in the {\GAP} library
## that was (up to permutations of classes and characters) contained already
## in the {\sf CAS} table library.
## When one fetches <tbl> from the library, one does in general not get the
## original {\sf CAS} table.
## Namely, in many cases (mostly {\ATLAS} tables, see~"ATLAS Tables")
## the identifier of the table (see~"ref:Identifier!for character tables"
## in the {\GAP} Reference Manual) as well as the ordering of classes and
## characters are different for the {\sf CAS} table and its {\GAP} version.
##
## Note that in several cases, the {\sf CAS} library contains different
## tables of the same group,
## in particular these tables may have different names and orderings of
## classes and characters.
##
## The `CASInfo' value of <tbl>, if stored, is a list of records,
## each describing the relation between <tbl> and a character table in the
## {\sf CAS} library.
## The records have the components
## \beginitems
## `name' &
## the name of the {\sf CAS} table,
##
## `permchars' and `permclasses' &
## permutations of the `Irr' values and the classes of <tbl>,
## respectively, that must be applied in order to get the orderings in
## the original {\sf CAS} table, and
##
## `text' &
## the text that was stored on the {\sf CAS} table
## (which may contain incorrect statements).
## \enditems
##
DeclareAttributeSuppCT( "CASInfo", IsNearlyCharacterTable,
[ "class", "character" ] );
#############################################################################
##
#A Maxes( <tbl> )
##
## is a list of identifiers of the tables of all maximal subgroups of <tbl>.
## This is meaningful only for library tables,
## and there is no default method to compute the value.
##
## If the `Maxes' value of <tbl> is stored then it lists exactly one
## representative for each conjugacy class of maximal subgroups of the group
## of <tbl>,
## and the tables of these maximal subgroups are available in the {\GAP}
## table library, and the fusions to <tbl> are stored on these tables.
##
DeclareAttributeSuppCT( "Maxes", IsNearlyCharacterTable, [] );
#############################################################################
##
#A ConstructionInfoCharacterTable( <tbl> )
##
## If this attribute is set for an ordinary character table <tbl> then
## the value is a list that describes how this table was constructed.
## The first entry is a string that is the identifier of the function that
## was applied to the pre-table record; the remaining entries are the
## arguments for that functions, except that the pre-table record must be
## prepended to these arguments.
#T should this be available also for other tables than library tables?
#T (direct products of tables with groups and library tables etc.)
#T and if it is a `SuppCT' attribute then should row/column permutations
#T be always optional arguments to be applied after the constuction?
##
DeclareAttributeSuppCT( "ConstructionInfoCharacterTable",
IsNearlyCharacterTable, [] );
#############################################################################
##
#A FusionToTom( <tbl> )
##
## If this attribute is set for an ordinary character table <tbl> then
## the {\GAP} Library of Tables of Marks contains the table of marks of the
## group of <tbl>, and the attribute value is a record with the following
## components.
## \beginitems
## `name' &
## the `Identifier' component of the table of marks of <tbl>,
##
## `map' &
## the fusion map, and
##
## `text' (optional) &
## a string describing the status of the fusion.
## \enditems
##
DeclareAttributeSuppCT( "FusionToTom", IsNearlyCharacterTable, [ "class" ] );
#############################################################################
##
#A ProjectivesInfo( <tbl> )
##
## If this attribute is set for an ordinary character table <tbl> then
## the value is a list of records, each with the following components.
## \beginitems
## `name' &
## the `Identifier' value of the character table <mult> of the covering
## whose faithful irreducible characters are described by the record,
##
## `chars' &
## a list of values lists of faithful projective irreducibles;
## only one representative of each family of Galois conjugates is
## contained in this list,
## and
##
## `map' &
## a list of positions that maps each class of <tbl> to that preimage in
## <mult> for which the entries in `chars' give the values.
## In a sense, a projection map is an inverse of the factor fusion from
## the table of the covering to the given table
## (see~"ref:ProjectionMap" in the {\GAP} Reference Manual).
## \enditems
##
DeclareAttributeSuppCT( "ProjectivesInfo", IsNearlyCharacterTable,
[ "class" ] );
#############################################################################
##
#A ExtensionInfoCharacterTable( <tbl> )
##
## Let <tbl> be the ordinary character table of a group $G$, say.
## If this attribute is set for <tbl> then the value is a list of length
## two,
## the first entry being a string <M> that describes the Schur multiplier
## of $G$ and the second entry being a string <A> that describes the outer
## automorphism group of $G$.
## Trivial multiplier or outer automorphism group are denoted by an empty
## string.
##
## If <tbl> is a table from the {\GAP} Character Table Library and $G$ is
## (nonabelian and) simple then the value is set.
## In this case, an admissible name for the character table of the
## Darstellungsgruppe of $G$ (if this table is available and different from
## <tbl>) is given by the concatenation of <M>, `"."', and the `Identifier'
## value of <tbl>.
## Analogously, an admissible name for the character table of the
## automorphism group of $G$ (if this table is available and different from
## <tbl>) is given by the concatenation of the `Identifier' value of <tbl>,
## `"."', and <A>.
##
DeclareAttributeSuppCT( "ExtensionInfoCharacterTable",
IsNearlyCharacterTable, [] );
#############################################################################
##
#F GaloisPartnersOfIrreducibles( <tbl>, <characters>, <n> )
##
DeclareGlobalFunction( "GaloisPartnersOfIrreducibles" );
#############################################################################
##
#F AtlasLabelsOfIrreducibles( <tbl>[, "short"] )
##
## Let <tbl> be the (ordinary or Brauer) character table of a bicyclic
## extension of a simple group that occurs in the
## {\ATLAS} of Finite Groups~\cite{CCN85} or the
## {\ATLAS} of Brauer Characters~\cite{JLPW95}.
## `AtlasLabelsOfIrreducibles' returns a list of strings, the $i$-th entry
## being a label for the $i$-th irreducible character of <tbl>.
##
## The labels have the following form.
## We state the rules only for ordinary characters,
## the rules for Brauer characters are obtained by replacing $\chi$
## by $\varphi$.
##
## First consider only downward extensions $m\.G$ of a simple group $G$.
## If $m \leq 2$ then only labels of the form $\chi_i$ occur,
## which denotes the $i$-th ordinary character shown in the {\ATLAS}.
##
## The labels of faithful ordinary characters of groups $m\.G$ with $m\geq 3$
## are of the form $\chi_i$, $\chi_i^{\ast}$, or $\chi_i^{\ast k}$,
## which means the $i$-th character printed in the {\ATLAS},
## the unique character that is not printed and for which $\chi_i$ acts as
## proxy
## (see~Sections~8 and~19 of Chapter~7 in the {\ATLAS} of Finite Groups),
## and the image of the printed character $\chi_i$ under the algebraic
## conjugacy operator $\ast k$, respectively.
##
## For groups $m\.G\.a$ with $a > 1$, the labels of the irreducible characters
## are derived from the labels of the irreducible constituents of their
## restrictions to $m\.G$, as follows.
## \beginlist
## \item{1.}
## If the ordinary irreducible character $\chi_i$ of $m\.G$ extends to
## $m\.G\.a$ then the $a^{\prime}$ extensions are denoted by
## $\chi_{i,0}, \chi_{i,1}, \ldots, \chi_{i,a^{\prime}}$,
## where $\chi_{i,0}$ is the character whose values are printed in the
## {\ATLAS}.
## \item{2.}
## The label $\chi_{i_1 + i_2 + \cdots + i_a}$ means that $a$ different
## characters $\chi_{i_1}, \chi_{i_2}, \ldots, \chi_{i_a}$ of $m\.G$
## induce to an irreducible character of $m\.G\.a$ with this label.
##
## If the string `\"short\"' was entered as the second argument then the
## label has the short form $\chi_{i_1+}$.
## Note that $i_2, i_3, \ldots, i_a$ can be read off from the
## fusion signs in the {\ATLAS}.
## \item{3.}
## Finally, the label
## $\chi_{i_1,j_1 + i_2,j_2 + \cdots + i_{a^{\prime}},j_{a^{\prime}}}$
## means that the characters
## $\chi_{i_1}, \chi_{i_2}, \ldots, \chi_{i_{a^{\prime}}}$ of $m\.G$
## extend to a group that lies properly between $m\.G$ and $m\.G\.a$,
## and the extensions $\chi_{i_1,j_1}, \chi_{i_2,j_2}, \ldots
## \chi_{i_{a^{\prime}},j_{a^{\prime}}}$
## induce to an irreducible character of $m\.G\.a$ with this label.
##
## Again, if the string `\"short\"' was entered as the second argument
## then the label has a short form, namely $\chi_{i,j+}$.
## \endlist
##
DeclareGlobalFunction( "AtlasLabelsOfIrreducibles" );
#############################################################################
##
#F NameOfLibraryCharacterTable( <tomname> )
##
## This function is used in the interface between the {\GAP} libraries of
## character tables and of tables of marks.
## If the table of marks with the name <tomname> has been notified as the
## table of marks of a {\GAP} library character table (in the sense that the
## `name' component of the `FusionToTom' (see~"FusionToTom") value of the
## character table is set to <tomname>) then the return value is an
## admissible name of this character table.
## Otherwise `fail' is returned.
##
DeclareGlobalFunction( "NameOfLibraryCharacterTable" );
#############################################################################
##
#E
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