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NotDiEqvBiNot
⊢
¬
f
≡
¬
f
NotDiEqvBiNot
Proof:
1
⊢
f
≡¬¬
f
Prop
2
⊢
f
≡
¬¬
f
1
,
DiEqvDi
3
⊢ ¬
f
≡¬
¬¬
f
2
,
Prop
4
⊢ ¬
f
≡
¬
f
3
,
def. of
qed
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2024-08-03
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