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Step * 1 of Lemma sq_stable__from_stable


1. [P] : ℙ
2. P supposing ¬¬P
3. ↓P
⊢ P
BY
{ BackThruHyp 2 }

1
1. P : ℙ
2. P supposing ¬¬P
3. ↓P
⊢ ¬¬P

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Latex:

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Latex:

1.  [P]  :  \mBbbP{}
2.  P  supposing  \mneg{}\mneg{}P
3.  \mdownarrow{}P
\mvdash{}  P


By

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Latex:
BackThruHyp  2

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