| Some definitions of interest. | |
| divides |  c:  . a = b  c | 
|  a,b:  . (a | b)  Prop | |
| int_seg |  } == {k:  | i  k < j } | 
|  m,n:  . {m..n  }  Type | |
| int_upper |  | i  j } | 
|  n:  . {n...}  Type | |
| nat |  == {i:  | 0  i } | 
|    Type | |
| le |  B ==  B<A | 
|  i,j:  . (i  j)  Prop | |
| nat_plus |   == {i:  | 0<i } | 
|     Type | |
| not |  A == A   False | 
|  A:Prop. (  A)  Prop | 
About:
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