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BoxEqvTrueYields
⊢
f
≡
true
f
BoxEqvTrueYields
Proof:
1
⊢
true
;
¬
f
≡
¬
f
TrueChopEqvDiamond
2
⊢ ¬
(
true
;
¬
f
)
≡¬
¬
f
1
,
Prop
3
⊢
f
≡¬
¬
f
PTL
4
⊢
f
≡¬
(
true
;
¬
f
)
2
,
3
,
Prop
5
⊢
f
≡
true
f
4
,
def. of
qed
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2023-09-12
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