fact: Definition three_rec_dep (P : three -> UU): P (● 0) -> P (● 1) -> P (● 2) -> ∏ n, P n.
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions