Step 
*
 of Lemma 
polynom_alg_wf
∀S:DSet. ∀A:CRng.  (polynom_alg{i:l}(S;A) ∈ 𝕌')
BY
 
{ Unfold `polynom_alg` 0 THEN Auto }
 
Latex: 
Latex:
\mforall{}S:DSet.  \mforall{}A:CRng.    (polynom\_alg\{i:l\}(S;A)  \mmember{}  \mBbbU{}')
 By 
Latex:
Unfold  `polynom\_alg`  0  THEN  Auto
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