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Def l[i] == hd(nth_tl(i;l))

is mentioned by

Thm* s:T List. 0 < ||s|| (s ~ (firstn(||s||-1;s) @ [s[(||s||-1)]]))[list-decomp-last]
Thm* i,j:, k:(j-i). upto(i;j)[k] = i+k[select_upto]
Thm* L:T List, P:(T). (xL.P(x)) (i:||L||. P(L[i]))[assert_l_bexists]
Thm* L:T List, P:(T). (xL.P(x)) (i:||L||. P(L[i]))[assert_l_ball]

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