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DaIntro
⊢
f
⊃
f
DaIntro
Proof:
1
⊢
¬
f
⊃¬
f
BaElim
2
⊢ ¬¬
f
⊃¬
¬
f
1
,
Prop
3
⊢
f
≡¬¬
f
Prop
4
⊢
f
≡¬
¬
f
DaEqvNotBaNot
5
⊢
f
⊃
f
2
,
3
,
4
,
Prop
qed
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2023-09-12
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