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DiNotBaImpNotBa
⊢
¬
f
⊃¬
f
DiNotBaImpNotBa
Proof:
1
⊢
f
≡
f
BaEqvBaBa
2
⊢
f
⊃
f
BaImpBi
3
⊢
f
⊃
f
1
,
2
,
Prop
4
⊢
f
⊃¬
¬
f
3
,
def. of
5
⊢
¬
f
⊃¬
f
4
,
Prop
qed
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2023-09-12
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