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NowImpDiamond
⊢
f
⊃
f
NowImpDiamond
Proof:
1
⊢
empty
;
f
≡
f
EmptyChop
2
⊢
empty
⊃
true
Prop
3
⊢
empty
;
f
⊃
true
;
f
2
,
LeftChopImpChop
4
⊢
f
⊃
true
;
f
1
,
3
,
Prop
5
⊢
f
⊃
f
4
,
def. of
qed
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2023-09-12
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