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BoxImpYields
⊢
g
⊃
f
g
BoxImpYields
Proof:
1
⊢
f
;
¬
g
⊃
¬
g
ChopImpDiamond
2
⊢ ¬
¬
g
⊃¬
(
f
;
¬
g
)
1
,
Prop
3
⊢
g
⊃
f
g
2
,
def. of
,
qed
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2024-08-03
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