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DiImpDi
⊢
f
⊃
g
⇒ ⊢
f
⊃
g
DiImpDi
Proof:
1
⊢
f
⊃
g
given
2
⊢
f
;
true
⊃
g
;
true
1
,
LeftChopImpChop
3
⊢
f
⊃
g
2
,
def. of
qed
Another corollary is the following:
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2023-09-12
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