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Step * 1 of Lemma xmiddle-implies-stable


1. XM
2. P : ℙ
⊢ Stable{P}
BY
{ UnfoldTopAb 0 }

1
1. XM
2. P : ℙ
⊢ P supposing ¬¬P

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Latex:

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Latex:

1.  XM
2.  P  :  \mBbbP{}
\mvdash{}  Stable\{P\}


By

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Latex:
UnfoldTopAb  0

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