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DaNotEqvNotBa
⊢
¬
f
≡¬
f
DaNotEqvNotBa
Proof:
1
⊢
f
≡¬
¬
f
def. of
2
⊢
¬
f
≡¬
f
1
,
Prop
qed
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2023-09-12
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