fact: Definition nelstructoncoprod {X Y : UU} {n m : nat} (sx : nelstruct n X) (sy : nelstruct m Y) : nelstruct (n + m) (X ⨿ Y) := ((weqcoprodf sx sy) ∘ (invweq (weqfromcoprodofstn n m)))%weq.
imports: UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions UniMath.Combinatorics.StandardFiniteSets UniMath.MoreFoundations.Subtypes