| Some definitions of interest. |
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int_lower | Def {...i} == {j: | j i } |
| | Thm* i: . {...i} Type |
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int_seg | Def {i..j } == {k: | i k < j } |
| | Thm* m,n: . {m..n } Type |
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length | Def ||as|| == Case of as; nil 0 ; a.as' ||as'||+1 (recursive) |
| | Thm* A:Type, l:A List. ||l||  |
| | Thm* ||nil||  |
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listify | Def f{m..n } == if n m nil else f(m).f{(m+1)..n } fi (recursive) |
| | Thm* T:Type, m,n: , f:({m..n } T). f{m..n } T List |