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Step * of Lemma rccint_wf

∀[a,b:ℝ].  ([a, b] ∈ Interval)
BY
{ (Unfolds ``rccint interval`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[a,b:\mBbbR{}].    ([a,  b]  \mmember{}  Interval)


By

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

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