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NotBaChopImpNotBa
⊢
(
¬
f
) ;
g
⊃¬
f
NotBaChopImpNotBa
Proof:
1
⊢
(
¬
f
) ;
g
⊃
¬
f
ChopImpDi
2
⊢
¬
f
⊃¬
f
DiNotBaImpNotBa
3
⊢
(
¬
f
) ;
g
⊃¬
f
1
,
2
,
ImpChain
qed
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2024-08-03
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