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Step * of Lemma singleton-center_wf

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∀[X:j⊢]. ∀[A:{X ⊢ _}]. ∀[a:{X ⊢ _:A}].  (singleton-center(X;a) ∈ {X ⊢ _:Singleton(a)})
BY
{ (Auto THEN Unfold `singleton-type` 0 THEN Unfold `singleton-center` 0 THEN Auto) }

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Latex:

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Latex:
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\mforall{}[X:j\mvdash{}].  \mforall{}[A:\{X  \mvdash{}  \_\}].  \mforall{}[a:\{X  \mvdash{}  \_:A\}].    (singleton-center(X;a)  \mmember{}  \{X  \mvdash{}  \_:Singleton(a)\})


By

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Latex:
(Auto  THEN  Unfold  `singleton-type`  0  THEN  Unfold  `singleton-center`  0  THEN  Auto)

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