fact: Definition isDivRig_islunit_x1 {X : rig} (is : isDivRig X) : islunit (isDivRig_mult is) (isDivRig_one is) := riglunax2 X.
imports: UniMath.Foundations.Sets UniMath.Algebra.RigsAndRings UniMath.Algebra.Domains_and_Fields UniMath.MoreFoundations.Tactics