-- Copyright (c) 2014 Microsoft Corporation. All rights reserved. -- Released under Apache 2.0 license as described in the file LICENSE. -- Author: Jeremy Avigad -- TODO: add notation for negation (in the sense of homotopy type theory) -- Empty type -- ---------- inductive empty : Type namespace empty theorem elim [protected] (A : Type) (H : empty) : A := rec (λe, A) H end empty