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Step * 1 of Lemma sq_stable_usquash


1. [T] : ℙ
2. ↓usquash(T)
⊢ usquash(T)
BY
{ UseWitness ⌜Ax⌝⋅ }

1
1. T : ℙ
2. ↓usquash(T)
⊢ Ax ∈ usquash(T)

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Latex:

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Latex:

1.  [T]  :  \mBbbP{}
2.  \mdownarrow{}usquash(T)
\mvdash{}  usquash(T)


By

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Latex:
UseWitness  \mkleeneopen{}Ax\mkleeneclose{}\mcdot{}

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