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FBoxImpDiamondImpDiamond
⊢
(
f
⊃
g
)
⊃
f
⊃
g
FBoxImpDiamondImpDiamond
Proof:
1
(
f
⊃
g
)
⊃ ⟨
skip
∗
⟩
f
⊃ ⟨
skip
∗
⟩
g
FL9
2
f
≡⟨
skip
∗
⟩
f
FL3
3
g
≡⟨
skip
∗
⟩
g
FL3
4
(
f
⊃
g
)
⊃
f
⊃
g
2
,
3
,
Prop
qed
The following slightly obscure theorem is used in the proof of
FBoxImpDist
:
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2023-09-12
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