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ImpDi
⊢
f
⊃
f
ImpDi
Proof:
1
⊢
f
;
empty
≡
f
ChopEmpty
2
⊢
empty
⊃
true
Prop
3
⊢
f
;
empty
⊃
f
;
true
2
,
RightChopImpChop
4
⊢
f
⊃
f
;
true
1
,
3
,
Prop
5
⊢
f
⊃
f
4
,
def. of
qed
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2024-08-03
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