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Step * of Lemma rcoint_wf

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

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