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Mdef
⊢
f
≡¬
¬
f
Mdef
Proof:
1
f
≡¬¬
f
Prop
2
f
≡
¬¬
f
1
,
DfEqvDf
3
¬¬
f
≡¬¬
¬¬
f
Prop
4
¬¬
f
≡¬
¬
f
3
,
def. of
5
f
≡¬
¬
f
2
,
4
,
EqvChain
qed
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2023-09-12
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