fact: Definition nelstructoncoprodwithunit {X : UU} {n : nat} (sx : nelstruct n X) : nelstruct (S n) (X ⨿ unit) := weqcomp (invweq (weqdnicoprod n lastelement)) (weqcoprodf1 sx).
imports: UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions UniMath.Combinatorics.StandardFiniteSets UniMath.MoreFoundations.Subtypes