Step 
*
 of Lemma 
algebra_sig_wf
∀A:Type. (algebra_sig{i:l}(A) ∈ 𝕌')
BY
 
{ Unfold `algebra_sig` 0 THEN Auto }
 
Latex: 
Latex:
\mforall{}A:Type.  (algebra\_sig\{i:l\}(A)  \mmember{}  \mBbbU{}')
 By 
Latex:
Unfold  `algebra\_sig`  0  THEN  Auto
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