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ChopImpDf
⊢
f ⌢ g
⊃
f
ChopImpDf
Proof:
1
g
⊃
true
Prop
2
f ⌢ g
⊃
f ⌢
true
1
,
RightChopImpChop
3
f ⌢ g
⊃
f
2
,
def. of
qed
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2024-08-03
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