fact: Definition PolZmul : PolZ -> PolZ -> PolZ := @Pmul Z 0%Z 1%Z Z.add Z.mul Zeq_bool.
imports: List Setoid BinPos BinList Znumtheory Morphisms Setoid Bool Algebra_syntax Ncring Ncring_initial Ncring_tac Integral_domain ZArith Lia