fact: Definition divDivRig {F : DivRig} : F -> (∑ x : F, x != zeroDivRig) -> F := λ x y, multDivRig x (invDivRig y).
imports: UniMath.Foundations.Sets UniMath.Algebra.RigsAndRings UniMath.Algebra.Domains_and_Fields UniMath.MoreFoundations.Tactics