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BiImpDiImpDi
⊢
(
f
⊃
g
)
⊃
f
⊃
g
BiImpDiImpDi
Proof:
1
⊢
(
f
⊃
g
)
⊃
(
f
;
true
)
⊃
(
g
;
true
)
BiChopImpChop
2
⊢
(
f
⊃
g
)
⊃
f
⊃
g
1
,
def. of
qed
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2023-09-12
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