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Step * of Lemma rooint_wf

∀[l,u:ℝ].  ((l, u) ∈ Interval)
BY
{ (Unfolds ``rooint interval`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[l,u:\mBbbR{}].    ((l,  u)  \mmember{}  Interval)


By

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Latex:
(Unfolds  ``rooint  interval``  0  THEN  Auto)

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