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BfImpDfImpDf
⊢
(
f
⊃
g
)
⊃
f
⊃
g
BfImpDfImpDf
Proof:
1
(
f
⊃
g
)
⊃
(
f ⌢
true
)
⊃
(
g ⌢
true
)
BfChopImpChop
2
(
f
⊃
g
)
⊃
f
⊃
g
1
,
def. of
qed
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2024-08-03
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