Step 
*
 of Lemma 
rpoly-deriv_wf
∀n:ℕ. ∀a:ℕn + 1 ⟶ ℝ. ∀x:ℝ.  (rpoly-deriv(n;a;x) ∈ ℝ)
BY
 
{ ProveWfLemma }
 
Latex: 
Latex:
\mforall{}n:\mBbbN{}.  \mforall{}a:\mBbbN{}n  +  1  {}\mrightarrow{}  \mBbbR{}.  \mforall{}x:\mBbbR{}.    (rpoly-deriv(n;a;x)  \mmember{}  \mBbbR{})
 By 
Latex:
ProveWfLemma
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