0
nil else upto(n-1) @ [(n-1)] fi (recursive)
n:
. upto(n) 
n Listj == if i=j true ; false fii,j:
. (i=j) 
} == {k:| i 
k < j }m,n:. {m..n} Type == {i:| 0i } TypeA:Type, l:A List, n:. 0n 
n<||l|| l[n] A| Some definitions of interest. | |
| upto | 0 nil else upto(n-1) @ [(n-1)] fi (recursive) |
| n:. upto(n) n List | |
| eq_int | j == if i=j true ; false fi |
| i,j:. (i=j) | |
| int_seg | } == {k:| i k < j } |
| m,n:. {m..n} Type | |
| nat | == {i:| 0i } |
| Type | |
| select | |
| A:Type, l:A List, n:. 0n n<||l|| l[n] A |
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