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DiamondDfNotEqvNotBoxBf
⊢
¬
f
≡¬
f
DiamondDfNotEqvNotBoxBf
Proof:
1
¬
f
≡¬
f
DfNotEqvNotBf
2
¬
f
≡
¬
f
1
,
DiamondEqvDiamond
3
¬
f
≡¬
f
DiamondNotEqvNotBox
4
¬
f
≡¬
f
2
,
3
,
EqvChain
qed
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2023-09-12
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