| Some definitions of interest. | |
| trivial_factorization |  z  1 else 0 fi | 
|  a,b:  , z:{a..b  }. trivial_factorization(z)  {a..b  }    | |
| eq_int |  j == if i=j  true  ; false  fi | 
|  i,j:  . (i=  j)    | |
| nat |  == {i:  | 0  i } | 
|    Type | |
| nequal |  b  T ==  a = b  T | 
|  A:Type, x,y:A. (x  y)  Prop | 
About:
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