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Step * of Lemma rciint_wf

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

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Latex:

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


By

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

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