Comments (5)
CNF vs FOF language:
fun normalize (Problem {formulas,...}) =
let
val {cnfAxioms,fofAxioms,goal} = partitionFormulas formulas
val acc = (initialNormalization, Normalize.initialCnf)
val acc = List.foldl addCnfAxiom acc cnfAxioms
val acc = List.foldl addFofAxiom acc fofAxioms
in
case goal of
NoGoal => [normProblemFalse acc]
| CnfGoal cls => [normProblemFalse (List.foldl addCnfGoal acc cls)]
| FofGoal goals => splitProblem acc goals
end;
end;
where
val addCnfAxiom = addCnf AxiomRole;
val addCnfGoal = addCnf NegatedConjectureRole;
from agda-metis.
Metis showed that nimpl
case is not a iff, use this problem to show it is countersatisfiable.
fof(goal, conjecture, (p & ((~ p) => (~ q))) => (~ (p => q)) ).
And against of nbiimpl
case:
fof(goal, conjecture,
(p & ((~ p) => ~ q) & q & ((~ q) => (~ p)) ) => (~ (p <=> q))
).
from agda-metis.
From the Metis's sources, to handle the nbiimpl case:
fof(goal, conjecture,
(~ (p <=> q)) <=> ((p => ~ q) & (q => ~ p))
).
Look here: https://github.com/gilith/metis/blob/f0b1a17cd57eb098077e963ab092477aee9fb340/src/problems.sml#L218
from agda-metis.
For handle the nimpl case, we are going to use
fof(goal, conjecture,
(~ (p => q)) <=> (p & (p => ~ q))
).
from agda-metis.
from agda-metis.
Related Issues (15)
- atp-resolve exhibits a pattern HOT 1
- canonicalize
- thm-reorder-v omits cases HOT 1
- mix of a reordering ∧ and ∨.
- atp-conjunct HOT 1
- Theorems to simplify expressions HOT 2
- Improve the proof for build-∨ HOT 1
- Missing proofs for auxiliar theorem in Resolve module HOT 1
- clausify evidence
- canonicalize evidence HOT 4
- Normalized Formula data type HOT 1
- Deduce $false in this case
- Missing case in atp-conjunct, fails projecting.
- steps-contraction is correct? I'm not sure at the moment. HOT 3
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from agda-metis.