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LeftYieldsImpYields
⊢
f
⊃
f
1
⇒ ⊢
(
f
1
g
)
⊃
(
f
g
)
LeftYieldsImpYields
Proof:
1
⊢
f
⊃
f
1
given
2
⊢
f
;
¬
g
⊃
f
1
;
¬
g
1
,
LeftChopImpChop
3
⊢ ¬
(
f
1
;
¬
g
)
⊃¬
(
f
;
¬
g
)
2
,
Prop
4
⊢
f
1
g
⊃
f
g
3
,
def. of
qed
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2024-08-03
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