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Step * of Lemma cubical-beta

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∀[X:j⊢]. ∀[A:{X ⊢ _}]. ∀[B:{X.A ⊢ _}]. ∀[b:{X.A ⊢ _:B}]. ∀[u:{X ⊢ _:A}].  (app((λb); u) = (b)[u] ∈ {X ⊢ _:(B)[u]})
BY
{ PresheafMLTTInstance Obid: presheaf-beta⋅ }

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Latex:

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Latex:
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\mforall{}[X:j\mvdash{}].  \mforall{}[A:\{X  \mvdash{}  \_\}].  \mforall{}[B:\{X.A  \mvdash{}  \_\}].  \mforall{}[b:\{X.A  \mvdash{}  \_:B\}].  \mforall{}[u:\{X  \mvdash{}  \_:A\}].    (app((\mlambda{}b);  u)  =  (b)[u])


By

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Latex:
PresheafMLTTInstance  Obid:  presheaf-beta\mcdot{}

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