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Step * of Lemma strict-upper-bound_wf

∀[A:Set(ℝ)]. ∀[b:ℝ].  (A < b ∈ ℙ)
BY
{ (Unfold `strict-upper-bound` 0 THEN Auto)⋅ }

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Latex:

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


By

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Latex:
(Unfold  `strict-upper-bound`  0  THEN  Auto)\mcdot{}

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