fact: Definition weqdnicoprod (n : nat) (j : ⟦S n⟧ ) : ⟦n⟧ ⨿ unit ≃ ⟦S n⟧.
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions