A,B:Type, f:(A
B). Bij(A; B; f) 
PropA:Type. Id AA
} == {k:
| i 
k < j }m,n:. {m..n} Type
== {i:| 0i } Type| Some definitions of interest. | |
| biject | Def Bij(A; B; f) == Inj(A; B; f) & Surj(A; B; f) |
| Thm* A,B:Type, f:(AB). Bij(A; B; f) Prop | |
| identity | Def Id(x) == x |
| Thm* A:Type. Id AA | |
| int_seg | Def {i..j} == {k:| i k < j } |
| Thm* m,n:. {m..n} Type | |
| nat | Def == {i:| 0i } |
| Thm* Type |
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