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Code Activity
z3/examples/python
History
Guangyu (Gary) HU 704dc9375d
mini_ic3: fix generalize() returning empty/init-overlapping core (#9245) 
Two fixes in examples/python/mini_ic3.py:

1. generalize(): the polarity of the disjointness check was inverted,
   and there was no guard against an empty unsat core. With an empty
   core, And([])=True so check_disjoint(init, prev(True)) is always
   False (init is sat), and the code returned the empty core. That
   empty core then became cube2clause([])=Or([])=False, which got
   added as a lemma to all frames. The frame became inconsistent and
   is_valid() returned And(Or())=False as the "inductive invariant".

   Fix: require len(core) > 0 AND check_disjoint(init, prev(core))
   (without the spurious 'not'), so the core is only used when it
   is genuinely disjoint from init.

2. is_transition(): when an init rule's body happens to be an And
   without any Invariant predicate (e.g. (and (not A) (not B) ...)),
   is_body() returns (And(...), None). is_transition then passed
   inv0=None to subst_vars() which crashed inside get_vars(). Add an
   explicit None check so the rule falls through to is_init().

Verified on horn1..5 (unchanged behavior), h_CRC and h_FIFO from the
blocksys benchmarks (now correctly return CEX matching z3 spacer),
and cache_coherence_three (no longer collapses to (and or)).
2026-04-09 02:01:07 -07:00
..
bounded model checking three smt2 examples added and one python example updated (#5690) 2021-12-01 16:21:12 -08:00
complex fix #2365 2019-06-30 08:40:41 +03:00
data Add few more testcases 2018-12-28 13:28:15 -05:00
hamiltonian Fix typos in examples. 2019-08-14 22:00:50 -07:00
mus marco: immediately shrink to core if not subset (#5203) 2021-04-20 12:29:52 -07:00
tutorial use structured proof hints 2022-05-28 09:37:41 -07:00
all_interval_series.py travis timeouts 2021-02-21 13:13:19 +00:00
bincover.py Add branch and bound solver, for fun 2023-12-23 11:58:29 -08:00
CMakeLists.txt Ensure that the 'OUTPUT' locations in CMake for Python examples is accurate (#4499) 2020-06-04 15:04:01 -07:00
efsmt.py handle return status 2022-04-04 20:19:15 +02:00
example.py PYTHON_PATH should say PYTHONPATH. 2019-01-18 16:18:16 -08:00
hs.py updated experiment 2021-03-26 14:58:23 -07:00
mini_ic3.py mini_ic3: fix generalize() returning empty/init-overlapping core (#9245) 2026-04-09 02:01:07 -07:00
mini_quip.py Implement mini_quip 2019-01-04 18:30:02 -05:00
parallel.py Add comments 2018-05-19 11:16:20 +02:00
prooflogs.py add example for monitoring proof logs 2022-10-19 13:37:51 -07:00
proofreplay.py Fix some typos. (#7115) 2024-02-07 23:06:43 -08:00
rc2.py fix #5080 assertion is violated on legal input, add an example 2021-03-05 15:01:39 -08:00
README python example 2012-10-28 12:19:45 -07:00
simplify_formula.py formula simplification example 2022-08-11 09:33:36 +03:00
socrates.py Fix typos in examples. 2019-08-14 22:00:50 -07:00
trafficjam.py fix traffic jam 2019-06-10 17:45:55 -07:00
union_sort.py fix justification for implied equalities in special relations 2019-04-03 17:08:10 -07:00
visitor.py add example for #5933 2022-04-05 04:26:40 +02:00

README 

The example is copied to the build directory during configuration.
You can execute it using
    python example.py
in the build directory after you build Z3.