fact: Definition fincard_standardSubset {n : nat} (P : DecidableSubtype (⟦ n ⟧)) : nat := fincard (subsetFiniteness (isfinitestn n) P).
imports: UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions UniMath.Combinatorics.StandardFiniteSets UniMath.MoreFoundations.Subtypes