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DiEmpty
⊢
empty
DiEmpty
Proof:
1
⊢
true
PTL
2
⊢
empty
;
true
≡
true
EmptyChop
3
⊢
empty
;
true
1
,
2
,
Prop
4
⊢
empty
3
,
def. of
qed
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2023-09-12
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