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EmptyYields
⊢
empty
f
≡
f
EmptyYields
Proof:
1
⊢
empty
;
¬
f
≡¬
f
EmptyChop
2
⊢ ¬
(
empty
;
¬
f
)
≡
f
1
,
Prop
3
⊢
empty
f
≡
f
2
,
def. of
qed
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2023-09-12
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