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BiElim
⊢
f
⊃
f
BiElim
Proof:
1
⊢ ¬
f
⊃
¬
f
DiIntro
2
⊢
(
¬
f
⊃
¬
f
)
⊃
(
¬
¬
f
⊃
f
)
Prop
3
⊢ ¬
¬
f
⊃
f
1
,
2
,
MP
4
⊢
f
⊃
f
3
,
def. of
qed
The following is used in the proof of lemma
BiImpDist
:
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2023-09-12
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