blob: 43a8f3b8b78f953613218bdd919d60acfa4d8052 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
(* (c) Copyright 2006-2016 Microsoft Corporation and Inria. *)
Require Import ssreflect.
Require Import ssrbool.
Lemma test b : b || ~~b.
wlog _ : b / b = true.
case: b; [ by apply | by rewrite orbC ].
wlog suff: b / b || ~~b.
by case: b.
by case: b.
Qed.
Lemma test2 b c (H : c = b) : b || ~~b.
wlog _ : b {c H} / b = true.
by case: b H.
by case: b.
Qed.
|
