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Step * of Lemma i-approx-is-subinterval

∀I:Interval. ∀n:ℕ+.  i-approx(I;n) ⊆ I 
BY
{ (Unfold `subinterval` 0 THEN Auto THEN FLemma `i-member-approx` [-1] THEN Auto) }

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Latex:

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Latex:
\mforall{}I:Interval.  \mforall{}n:\mBbbN{}\msupplus{}.    i-approx(I;n)  \msubseteq{}  I 


By

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Latex:
(Unfold  `subinterval`  0  THEN  Auto  THEN  FLemma  `i-member-approx`  [-1]  THEN  Auto)

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