Step 
*
 of Lemma 
raise-left-endpoint_wf
∀[a,b:ℝ]. ∀[n:ℕ+].  (raise-left-endpoint(a;b;n) ∈ ℝ)
BY
 
{ ProveWfLemma }
 
Latex: 
Latex:
\mforall{}[a,b:\mBbbR{}].  \mforall{}[n:\mBbbN{}\msupplus{}].    (raise-left-endpoint(a;b;n)  \mmember{}  \mBbbR{})
 By 
Latex:
ProveWfLemma
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