fact: Definition isDivRig_inv {X : rig} (is : isDivRig X) : (∑ x : X, x != isDivRig_zero is) -> X := λ x, pr1 ((pr2 is) (pr1 x) (pr2 x)).
imports: UniMath.Foundations.Sets UniMath.Algebra.RigsAndRings UniMath.Algebra.Domains_and_Fields UniMath.MoreFoundations.Tactics