26 lines
551 B
Text
26 lines
551 B
Text
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/-
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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-/
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prelude
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import init.datatypes init.reserved_notation
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namespace bool
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definition cond {A : Type} (b : bool) (t e : A) :=
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rec_on b e t
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definition bor (a b : bool) :=
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rec_on a (rec_on b ff tt) tt
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notation a || b := bor a b
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definition band (a b : bool) :=
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rec_on a ff (rec_on b ff tt)
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notation a && b := band a b
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definition bnot (a : bool) :=
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rec_on a tt ff
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end bool
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