lean2/library/data/empty.lean

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-- 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
theorem empty_elim (A : Type) (H : empty) : A := empty_rec (λe, A) H