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BoxAndChopImport
⊢
h
∧
f
;
g
⊃
f
; (
h
∧
g
)
BoxAndChopImport
Proof:
1
⊢
h
⊃
g
⊃
(
h
∧
g
)
Prop
2
⊢
h
⊃
(
g
⊃
(
h
∧
g
))
1
,
BoxImpBoxRule
3
⊢
(
g
⊃
(
h
∧
g
))
⊃
f
;
g
⊃
f
; (
h
∧
g
)
BoxChopImpChop
4
⊢
h
∧
f
;
g
⊃
f
; (
h
∧
g
)
2
,
3
,
Prop
qed
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2023-09-12
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