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ImpCS
⊢
f
⊃
f
∗
ImpCS
Proof:
1
⊢
f
⊃
f
+
ImpChopPlus
2
⊢
f
⊃
empty
∨
f
+
1
,
Prop
3
⊢
f
⊃
f
∗
2
,
def. of
∗
qed
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2024-08-03
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