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FNextNotImpNotNext
⊢
¬
f
⊃ ¬
f
FNextNotImpNotNext
Proof:
1
f
⊃
f
FL10
2
f
⊃ ¬
¬
f
1
,
def. of
3
¬
f
⊃ ¬
f
2
,
Prop
qed
Here is a proof of PTL Axiom
A3
:
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2023-09-12
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