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NotDiFalse
⊢
¬
false
NotDiFalse
Proof:
1
⊢
true
⊃
true
StateImpBi
2
⊢
true
Prop
3
⊢
true
1
,
2
,
MP
4
⊢ ¬
¬
true
3
,
def. of
5
⊢ ¬
true
≡
false
Prop
6
⊢
¬
true
≡
false
5
,
DiEqvDi
7
⊢ ¬
false
4
,
6
,
Prop
qed
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2023-09-12
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