} == {k:
| i 
k < j }
m,n:. {m..n} 
Type
== {i:| 0i } Type
B == {f:(A
B)| Surj(A; B; f) }A,B:Type. A onto B Typeb:B. 
a:A. f(a) = bA,B:Type, f:(AB). Surj(A; B; f) Prop| Some definitions of interest. | |
| int_seg | } == {k:| i k < j } |
| m,n:. {m..n} Type | |
| nat | == {i:| 0i } |
| Type | |
| surjection_type | B == {f:(AB)| Surj(A; B; f) } |
| A,B:Type. A onto B Type | |
| surject | b:B. a:A. f(a) = b |
| A,B:Type, f:(AB). Surj(A; B; f) Prop |
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