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LeftYieldsEqvYields
⊢
f
≡
f
1
⇒ ⊢
(
f
g
)
≡
(
f
1
g
)
LeftYieldsEqvYields
Proof:
1
⊢
f
≡
f
1
given
2
⊢
f
;
¬
g
≡
f
1
;
¬
g
1
,
LeftChopEqvChop
3
⊢ ¬
(
f
;
¬
g
)
≡¬
(
f
1
;
¬
g
)
2
,
Prop
4
⊢
f
g
≡
f
1
g
3
,
def. of
qed
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2023-09-12
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