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BiEqvBiBi
⊢
f
≡
f
BiEqvBiBi
Proof:
1
⊢
¬
f
≡
¬
f
DiEqvDiDi
2
⊢
¬
f
≡¬
f
DiNotEqvNotBi
3
⊢
¬
f
≡
¬
f
2
,
DiEqvDi
4
⊢
¬
f
≡
¬
f
1
,
3
,
EqvChain
5
⊢ ¬
¬
f
≡¬
¬
f
4
,
Prop
6
⊢
f
≡
f
5
,
def. of
qed
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2023-09-12
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