fact: Definition coprod_stn_assoc (l m n : nat) : ( eqweqmap (maponpaths stn (natplusassoc l m n)) ∘ weqfromcoprodofstn (l+m) n ∘ weqcoprodf (weqfromcoprodofstn l m) (idweq _) ~ weqfromcoprodofstn l (m+n) ∘ weqcoprodf (idweq _) (weqfromcoprodofstn m n) ∘ weqcoprodasstor _ _ _ ) %weq.
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions