lean2/library/data/empty.lean
Leonardo de Moura dbaf81e16d refactor(library): remove unnecessary 'standard' subdirectory
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
2014-08-23 18:08:09 -07:00

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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