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ChopImpChop
⊢
f
⊃
f
1
,
⊢
g
⊃
g
1
⇒ ⊢
f
;
g
⊃
f
1
;
g
1
ChopImpChop
Proof:
1
⊢
f
⊃
f
1
given
2
⊢
f
;
g
⊃
f
1
;
g
1
,
LeftChopImpChop
3
⊢
g
⊃
g
1
given
4
⊢
f
1
;
g
⊃
f
1
;
g
1
3
,
RightChopImpChop
5
⊢
f
;
g
⊃
f
1
;
g
1
2
,
4
,
ImpChain
qed
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2024-08-03
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