Comments (3)
$ metis --version
metis 2.3.1 (release 20161108)
2.3.1? I got 2.3.
from metis.
Thank you for reporting this: the root-cause was a bug in the printing of the proof, specifically in the conversion of Xor sets to Iff lists. I've pushed and released a fixed version of Metis, and now the output looks like this:
$ metis --version
metis 2.3 (release 20170315)
$ metis --show proof problem.tptp
...
fof(normalize_2_0, plain, (~ p & (~ q <=> ~ r) & (~ p <=> (~ q <=> r))),
inference(canonicalize, [], [negate_2_0])).
fof(normalize_2_1, plain, (~ p <=> (~ q <=> r)),
inference(conjunct, [], [normalize_2_0])).
fof(normalize_2_2, plain, (~ q <=> ~ r),
inference(conjunct, [], [normalize_2_0])).
fof(normalize_2_3, plain, (~ p), inference(conjunct, [], [normalize_2_0])).
fof(normalize_2_4, plain, ($false),
inference(simplify, [],
[normalize_2_1, normalize_2_2, normalize_2_3])).
...
Now it's clear how Metis derived $false in this subgoal.
Cheers,
Joe
from metis.
Thanks Joe.
from metis.
Related Issues (11)
- Fatal error on a big file HOT 2
- No proof when the conjecture is $true HOT 3
- Two fatal errors on same TPTP problem, with non-default options HOT 2
- Ordered paramodulation vs. superposition HOT 1
- Expanding simplify inference HOT 1
- Splitting a goal that look like ~(p <=> q) HOT 3
- BUG found in metis program: Active.checkSaturated HOT 2
- [ BUG ] Simplify erroneously deduces $false HOT 1
- FATAL ERROR: BUG found in metis program: Active.simplify HOT 2
- BUG found in metis program HOT 5
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