Corollary isdeceqstn ( n : nat ) : isdeceq (⟦n⟧). Proof. unfold isdeceq. intros x x'. apply (isisolatedinstn x x' ). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions. Require Import UniMath.MoreFoundations.NegativePropositions.