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Step * 1 1 1 of Lemma xmiddle-implies-stable


1. XM
2. P : ℙ
3. ¬¬P
⊢ P
BY
{ ((With ⌜P⌝ (D 1) ⋅ THENM D -1) THEN Auto) }

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Latex:

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Latex:

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


By

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Latex:
((With  \mkleeneopen{}P\mkleeneclose{}  (D  1)  \mcdot{}  THENM  D  -1)  THEN  Auto)

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