fact: Definition dualelement_defs_eq {n : nat} (i : ⟦ n ⟧%stn) : dualelement i = dualelement' i.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Combinatorics.Maybe UniMath.Combinatorics.StandardFiniteSets UniMath.Algebra.Domains_and_Fields UniMath.Algebra.RigsAndRings