Step
*
of Lemma
aa_list_filter_indices_wf
T:Type. 
l:T List.  (aa_list_filter_indices(l) 
 
 ![](../FONT/dash.png)
 
 ![](../FONT/dash.png)
 (T List))
BY
{ ProveWfLemma }
\mforall{}T:Type.  \mforall{}l:T  List.    (aa\_list\_filter\_indices(l)  \mmember{}  \mBbbN{}  {}\mrightarrow{}  \mBbbB{}  {}\mrightarrow{}  (T  List))
By
ProveWfLemma
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