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BfBfEqvBf
⊢
f
≡
f
BfBfEqvBf
Proof:
1
¬
f
≡
¬
f
DfDfEqvDf
2
¬
f
≡¬
f
DfDfNotEqvNotBfBf
3
¬
f
≡
¬
f
1
,
2
,
Prop
4
¬
f
≡¬
f
DfNotEqvNotBf
5
¬
f
≡¬
f
3
,
4
,
EqvChain
6
f
≡
f
5
,
Prop
qed
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2024-08-03
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