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DiAndA
⊢
(
f
∧
g
)
⊃
f
DiAndA
Proof:
1
⊢
(
f
∧
g
) ;
true
⊃
f
;
true
AndChopA
2
⊢
(
f
∧
g
)
⊃
f
1
,
def. of
qed
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2023-09-12
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