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simplify: GF(f)=GF(dnf(f)) FG(f)=FG(cnf(f))

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These rules come from Delag's paper, and help some cases
in issue #385.

* spot/tl/simplify.cc: Implement the simplification.
* doc/tl/tl.tex, NEWS: Document it.
* tests/core/385.test: New file.
* tests/Makefile.am: Add it.
* tests/core/reduccmp.test: More tests.
* tests/core/ltl2tgba2.test: Adjust one improved case.
* tests/python/automata.ipynb, tests/python/twagraph-internals.ipynb:
Adjust expected output, as the cnf/dnf reorder some subformulas.
This commit is contained in:
Alexandre Duret-Lutz 2019-06-17 00:19:02 +02:00
parent df326e032b
commit da5d23f0a2
9 changed files with 2517 additions and 2291 deletions
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4
NEWS
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@ -105,9 +105,11 @@ New in spot 2.7.5.dev (not yet released)
- The LTL simplifier learned the following optional rules:
F(G(a | Fb)) = FGa | GFb (if option "favor_event_univ")
G(F(a | Gb)) = GFa | FGb (if option "favor_event_univ")
G(F(a | Gb)) = GFa | FGb (if option "favor_event_univ")
F(G(a & Fb) = FGa & GFb (unless option "reduce_size_strictly")
G(F(a & Gb)) = GFa & FGb (unless option "reduce_size_strictly")
GF(f) = GF(dnf(f)) (unless option "reduce_size_strictly")
FG(f) = FG(cnf(f)) (unless option "reduce_size_strictly")
- cleanup_parity() and colorize_parity() were cleaned up a bit,
resulting in fewer colors used in some cases. In particular,