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BaEqvBtBi
⊢
f
≡
f
BaEqvBtBi
Proof:
1
⊢
¬
f
≡
¬
f
DaEqvDtDi
2
⊢
¬
f
≡¬
f
DiNotEqvNotBi
3
⊢
¬
f
≡
¬
f
2
,
DiamondEqvDiamond
4
⊢ ¬
¬
f
≡
f
PTL
5
⊢ ¬
¬
f
≡
f
1
,
3
,
4
,
Prop
6
⊢
f
≡
f
5
,
def. of
qed
The following is a corollary of theorems
BaEqvBtBi
and
BaEqvBiBt
:
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2024-08-03
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