fact: Definition GCD (a b:R) : R := acc_gcd (guarded 100 ssr_lt_wf (norm b)) a (refl_equal (norm b)).
imports: HB(structures) Coq(ssreflect ssrfun ssrbool Arith.Wf_nat) mathcomp(eqtype ssrnat div seq path) mathcomp(ssralg fintype perm tuple choice generic_quotient) mathcomp(matrix bigop zmodp mxalgebra poly) stronglydiscrete