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Step * of Lemma rocint_wf

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

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