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BiEqvBi
⊢
f
≡
g
⇒ ⊢
f
≡
g
BiEqvBi
Proof:
1
⊢
f
≡
g
given
2
⊢ ¬
f
≡¬
g
1
,
Prop
3
⊢
¬
f
≡
¬
g
2
,
DiEqvDi
4
⊢ ¬
¬
f
≡¬
¬
g
3
,
Prop
5
⊢
f
≡
g
4
,
def. of
qed
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2023-09-12
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