/usr/include/singular/singular/kernel/spectrum/spectrum.h is in libsingular4-dev-common 1:4.1.0-p3+ds-2build1.
This file is owned by root:root, with mode 0o644.
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// spectrum.h
// begin of file
// Stephan Endrass, endrass@mathematik.uni-mainz.de
// 23.7.99
// ----------------------------------------------------------------------------
#ifndef SPECTRUM_H
#define SPECTRUM_H
#include <kernel/spectrum/npolygon.h>
#include <kernel/spectrum/splist.h>
/*BOOLEAN spectrumProc ( leftv,leftv );
BOOLEAN spectrumfProc( leftv,leftv );
BOOLEAN spaddProc ( leftv,leftv,leftv );
BOOLEAN spmulProc ( leftv,leftv,leftv );
BOOLEAN semicProc ( leftv,leftv,leftv );
BOOLEAN semicProc3 ( leftv,leftv,leftv,leftv );*/ //TODO move to kernel
BOOLEAN hasTermOfDegree( poly h, int d, const ring r );
int hasOne( ideal J, const ring r );
BOOLEAN hasAxis( ideal J,int k, const ring r );
poly computeWC( const newtonPolygon &np,Rational max_weight, const ring r );
void computeNF( ideal stdJ,poly hc,poly wc,spectrumPolyList *NF, const ring r );
//void spectrumPrintError(spectrumState state);
BOOLEAN ringIsLocal( const ring r);
BOOLEAN inline hasConstTerm( poly h, const ring r )
{ return hasTermOfDegree(h,0,r); }
BOOLEAN inline hasLinearTerm( poly h, const ring r )
{ return hasTermOfDegree(h,1,r); }
#endif
// ----------------------------------------------------------------------------
// spectrum.h
// end of file
// ----------------------------------------------------------------------------
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