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Step * 1 of Lemma sq_stable-implies-half-squash-stable

.....antecedent..... 
1. [P] : ℙ
2. ⇃(P)
⊢ ↓P
BY
{ (BLemma `squash-from-quotient` THEN Auto) }

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Latex:

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Latex:
.....antecedent..... 
1.  [P]  :  \mBbbP{}
2.  \00D9(P)
\mvdash{}  \mdownarrow{}P


By

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Latex:
(BLemma  `squash-from-quotient`  THEN  Auto)

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