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ChopImpDiamond
⊢
f
;
g
⊃
g
ChopImpDiamond
Proof:
1
⊢
f
⊃
true
Prop
2
⊢
f
;
g
⊃
true
;
g
1
,
LeftChopImpChop
3
⊢
f
;
g
⊃
g
2
,
def. of
qed
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2023-09-12
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