Step 
*
 of Lemma 
least-closed-set_wf
∀[B:Set{i:l}]. ∀[G:Set{i:l} ⟶ Set{i:l}].  (least-closed-set(B;G) ∈ Set{i:l})
BY
 
{ ProveWfLemma }
 
Latex: 
Latex:
\mforall{}[B:Set\{i:l\}].  \mforall{}[G:Set\{i:l\}  {}\mrightarrow{}  Set\{i:l\}].    (least-closed-set(B;G)  \mmember{}  Set\{i:l\})
 By 
Latex:
ProveWfLemma
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