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BaImpBi
⊢
f
⊃
f
BaImpBi
Proof:
1
⊢
f
≡
f
BaEqvBtBi
2
⊢
f
⊃
f
PTL
3
⊢
f
⊃
f
1
,
2
,
MP
qed
Here is an easy corollary:
⊢
f
⊃
f
DiImpDa
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2023-09-12
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