fact: Definition nelstructoncompl {X : UU} {n : nat} (x : X) : nelstruct (S n) X -> nelstruct n (compl X x).
imports: UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions UniMath.Combinatorics.StandardFiniteSets UniMath.MoreFoundations.Subtypes