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Step * of Lemma presheaf-sigma-at

∀[X,A,B,I,a:Top].  (Σ A B(a) ~ u:A(a) × B((a;u)))
BY
{ xxx((RepUR ``presheaf-type-at presheaf-sigma`` 0 THEN Fold `presheaf-type-at` 0) THEN Auto)xxx }

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Latex:

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Latex:
\mforall{}[X,A,B,I,a:Top].    (\mSigma{}  A  B(a)  \msim{}  u:A(a)  \mtimes{}  B((a;u)))


By

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Latex:
xxx((RepUR  ``presheaf-type-at  presheaf-sigma``  0  THEN  Fold  `presheaf-type-at`  0)  THEN  Auto)xxx

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