| | Who Cites nth tl? |
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| nth_tl | Def nth_tl(n;as) == if n 0 as else nth_tl(n-1;tl(as)) fi (recursive) |
| | | Thm* A:Type, as:A List, i: . nth_tl(i;as) A List |
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| tl | Def tl(l) == Case of l; nil nil ; h.t t |
| | | Thm* A:Type, l:A List. tl(l) A List |
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| le_int | Def i j ==  j< i |
| | | Thm* i,j: . (i j)  |
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| lt_int | Def i< j == if i<j true ; false fi |
| | | Thm* i,j: . (i< j)  |
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| bnot | Def  b == if b false else true fi |
| | | Thm* b: .  b  |