fact: Definition isnull (p : polyF) : cps bool := 'let n <- sizeT p; ret (n == 0).
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype choice ssrnat seq) mathcomp(fintype generic_quotient bigop ssralg poly) mathcomp(polydiv matrix mxpoly countalg ring_quotient)