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Add trivial identity {b}=b and !{b}=!b for any Boolean formula b.

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* src/ltlast/unop.cc: Perform the simplification.
* src/ltlast/unop.hh, doc/tl/tl.tex: Document it.
* src/ltltest/equals.test: Adjust test cases.
This commit is contained in:
Alexandre Duret-Lutz 2011-11-07 11:30:27 +01:00
parent 98f67973eb
commit 77d704ea9e
4 changed files with 28 additions and 18 deletions
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4
src/ltlast/unop.hh
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@ -1,4 +1,4 @@
// Copyright (C) 2009, 2010 Laboratoire de Recherche et Développement
// Copyright (C) 2009, 2010, 2011 Laboratoire de Recherche et Développement
// de l'Epita (LRDE).
// Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris
// 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
@ -73,9 +73,11 @@ namespace spot
/// - Closure([*0]) = 1
/// - Closure(1) = 1
/// - Closure(0) = 0
/// - Closure(b) = b
/// - NegClosure([*0]) = 0
/// - NegClosure(1) = 0
/// - NegClosure(0) = 1
/// - NegClosure(b) = !b
///
/// This rewriting implies that it is not possible to build an
/// LTL formula object that is SYNTACTICALLY equal to one of