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Step * of Lemma sup_wf

∀[A:Set(ℝ)]. ∀[b:ℝ].  (sup(A) = b ∈ ℙ)
BY
{ (Unfold `sup` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A:Set(\mBbbR{})].  \mforall{}[b:\mBbbR{}].    (sup(A)  =  b  \mmember{}  \mBbbP{})


By

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Latex:
(Unfold  `sup`  0  THEN  Auto)

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