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Step * of Lemma i-member-witness

∀I:Interval. ∀r:ℝ.  ((r ∈ I) ⇒ (∃n:ℕ+. (r ∈ i-approx(I;n))))
BY
{ (Auto THEN BLemma `i-member-iff` THEN Auto) }

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Latex:

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Latex:
\mforall{}I:Interval.  \mforall{}r:\mBbbR{}.    ((r  \mmember{}  I)  {}\mRightarrow{}  (\mexists{}n:\mBbbN{}\msupplus{}.  (r  \mmember{}  i-approx(I;n))))


By

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Latex:
(Auto  THEN  BLemma  `i-member-iff`  THEN  Auto)

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