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