B == {f:(A
B)| Bij(A; B; f) }
A,B:Type. A bij B 
Typex:A. x B) & (x:B. x A) B == {f:(AB)| Inj(A; B; f) }A,B:Type. A inj B Type
} == {k:
| i 
k < j }m,n:. {m..n} Type
== {i:| 0i } Type| Some definitions of interest. | |
| bijection_type | B == {f:(AB)| Bij(A; B; f) } |
| A,B:Type. A bij B Type | |
| exteq | x:A. x B) & (x:B. x A) |
| injection_type | B == {f:(AB)| Inj(A; B; f) } |
| A,B:Type. A inj B Type | |
| int_seg | } == {k:| i k < j } |
| m,n:. {m..n} Type | |
| nat | == {i:| 0i } |
| Type |
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