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At: nth tl decomp 4 2 1

1. T : Type
2. m : 
3. 0<m
4. L:T List. m-1<||L||  (nth_tl(m-1;L) ~ [L[(m-1)] / nth_tl(1+m-1;L)])
5. L : T List
6. m<||L||
7. 0<m
8. 0<1+m
  m-1<||tl(L)||


By: Inst Thm* l:A List. ||l|| ||tl(l)|| = ||l||-1   [T;L]


Generated subgoals:

None

About:
listconsintnatural_numberaddsubtractless_thanuniverseequalsqequalimpliesall
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