/usr/lib/s9fes/help/zerop is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 | R4RS 6.5.5 (zero? number) ==> boolean
(positive? number) ==> boolean
(negative? number) ==> boolean
(odd? integer) ==> boolean
(even? integer) ==> boolean
These numerical predicates test a number for a particular property,
returning #T or #F.
See also: note 2 in description of =.
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