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At: select cons tl 1 1

1. T : Type
2. a : T
3. as : T List
4. i : 
5. 0<i
6. i||as||
  hd(nth_tl(i;a.as)) = as[(i-1)]


By: RWNth 1 (RecUnfoldTopC `nth_tl`) 0 THEN SplitOnConclITE


Generated subgoal:

1 7. 0<i
  hd(nth_tl(i-1;tl((a.as)))) = as[(i-1)]

2 steps

About:
listconsintnatural_numbersubtractless_thanuniverseequal
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(5steps total) PrintForm Definitions list 1 Sections StandardLIB Doc