Step 
*
 of Lemma 
i-length_wf
∀[I:Interval]. |I| ∈ ℝ supposing i-finite(I)
BY
 
{ (Unfold `i-length` 0 THEN Auto) }
 
Latex: 
Latex:
\mforall{}[I:Interval].  |I|  \mmember{}  \mBbbR{}  supposing  i-finite(I)
 By 
Latex:
(Unfold  `i-length`  0  THEN  Auto)
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