/usr/lib/help/exactp is in scheme9 2013.11.26-1.
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1 2 3 4 5 6 | R4RS 6.5.5 (exact? number) ==> boolean
(inexact? number) ==> boolean
These numerical predicates provide tests for the exactness of a
quantity. For any Scheme number, precisely one of these predicates
is true.
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