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BoxChopImpChopBox
⊢
h
⊃
f
;
g
⊃
f
; (
h
∧
g
)
BoxChopImpChopBox
Proof:
1
⊢
h
⊃
(
g
⊃
h
∧
g
)
PTL
2
⊢
(
g
⊃
h
∧
g
)
⊃
f
;
g
⊃
f
; (
h
∧
g
)
BoxChopImpChop
3
⊢
h
⊃
f
;
g
⊃
f
; (
h
∧
g
)
1
,
2
,
Prop
qed
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2024-08-03
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