Library Stdlib.Logic.Description

This file provides a constructive form of definite description; it allows building functions from the proof of their existence in any context; this is weaker than Church's iota operator

Require Import ChoiceFacts.

Set Implicit Arguments.

Axiom constructive_definite_description :
forall (A : Type) (P : A ->Prop),
(exists ! x , P x ) -> { x : A | P x }.