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BoxImpNow
⊢
f
⊃
f
BoxImpNow
Proof:
1
¬
f
⊃
¬
f
FNowImpDiamond
2
¬
¬
f
⊃
f
1
,
Prop
3
f
⊃
f
2
,
def. of
qed
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2024-08-03
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