adamc@125: (* Copyright (c) 2008, Adam Chlipala
adamc@125:  * 
adamc@125:  * This work is licensed under a
adamc@125:  * Creative Commons Attribution-Noncommercial-No Derivative Works 3.0
adamc@125:  * Unported License.
adamc@125:  * The license text is available at:
adamc@125:  *   http://creativecommons.org/licenses/by-nc-nd/3.0/
adamc@125:  *)
adamc@125: 
adamc@125: (* Additional axioms not in the Coq standard library *)
adamc@125: 
adamc@125: Axiom ext_eq : forall (A : Type) (B : A -> Type)
adamc@125:   (f g : forall x, B x),
adamc@125:   (forall x, f x = g x)
adamc@125:   -> f = g.
adamc@125: 
adamc@125: Ltac ext_eq := apply ext_eq; intro.