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Step * of Lemma cubical-sigma-subset-adjoin2

∀[X,A,B,T1,T2,phi:Top].  (Σ A B ~ Σ A B)
BY
{ (RWO "cubical-sigma-normalize" 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[X,A,B,T1,T2,phi:Top].    (\mSigma{}  A  B  \msim{}  \mSigma{}  A  B)


By

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Latex:
(RWO  "cubical-sigma-normalize"  0  THEN  Auto)

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