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Step * 1 1 of Lemma xmiddle-implies-stable


1. XM
2. P : ℙ
⊢ P supposing ¬¬P
BY
{ (D 0 THENA Auto) }

1
1. XM
2. P : ℙ
3. ¬¬P
⊢ P

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Latex:

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Latex:

1.  XM
2.  P  :  \mBbbP{}
\mvdash{}  P  supposing  \mneg{}\mneg{}P


By

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Latex:
(D  0  THENA  Auto)

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