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BiImpBiRule
⊢
f
⊃
g
⇒ ⊢
f
⊃
g
BiImpBiRule
Proof:
1
⊢
f
⊃
g
given
2
⊢ ¬
g
⊃¬
f
1
,
Prop
3
⊢
¬
g
⊃
¬
f
2
,
DiImpDi
4
⊢ ¬
¬
f
⊃¬
¬
g
3
,
Prop
5
⊢
f
⊃
g
4
,
def. of
qed
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2024-08-03
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