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