fact: Definition lexicalEnumeration {n : nat} (m: ⟦n⟧ -> nat) : ⟦stnsum m⟧ ≃ (∑ i : ⟦n⟧, ⟦m i⟧) := invweq (weqstnsum1 m).
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions