} == {k:
| i 
k < j }
m,n:. {m..n} 
Type
== {i:| 0i } TypeB == 
B < Ai,j:. (ij) Prop
x,n. n+f(x))n:, f:(n
). sum(f(x) | x < n) | Some definitions of interest. | |
| int_seg | Def {i..j} == {k:| i k < j } |
| Thm* m,n:. {m..n} Type | |
| nat | Def == {i:| 0i } |
| Thm* Type | |
| le | Def AB == B < A |
| Thm* i,j:. (ij) Prop | |
| sum | Def sum(f(x) | x < k) == primrec(k;0;x,n. n+f(x)) |
| Thm* n:, f:(n). sum(f(x) | x < n) |
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