fact: Definition isofnelstn (n : nat) : isofnel n (⟦ n ⟧) := hinhpr (nelstructonstn n).
imports: UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions UniMath.Combinatorics.StandardFiniteSets UniMath.MoreFoundations.Subtypes