B == {f:(A
B)| Bij(A; B; f) }
A,B:Type. A bij B 
Type B == {f:(AB)| Inj(A; B; f) }A,B:Type. A inj B Type
B == i:
2. if i=
0 A else B fiA,B:Type. AB Type
T == x:S. x T B == {f:(AB)| Surj(A; B; f) }A,B:Type. A onto B Type| Some definitions of interest. | |
| bijection_type | B == {f:(AB)| Bij(A; B; f) } |
| A,B:Type. A bij B Type | |
| injection_type | B == {f:(AB)| Inj(A; B; f) } |
| A,B:Type. A inj B Type | |
| isect_two | B == i:2. if i=0 A else B fi |
| A,B:Type. AB Type | |
| subtype | T == x:S. x T |
| surjection_type | B == {f:(AB)| Surj(A; B; f) } |
| A,B:Type. A onto B Type |
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