fact: Fixpoint mult_l (la : list PEZ) (lp: list PolZ) : PolZ := match la, lp with | a::la, p::lp => PolZadd (PolZmul (norm a) p) (mult_l la lp) | _, _ => P0Z end.
imports: List Setoid BinPos BinList Znumtheory Morphisms Setoid Bool Algebra_syntax Ncring Ncring_initial Ncring_tac Integral_domain ZArith Lia