| Who Cites int nzero? | |
| int_nzero | Def    == {i:  | i  0 } | 
| Thm*      Type | |
| le | Def A  B ==  B < A | 
| Thm*  i,j:  . i  j  Prop | |
| nat_plus | Def   == {i:  | 0 < i } | 
| Thm*     Type | |
| nequal | Def a  b  T ==  a = b  T | 
| Thm*  A:Type, x,y:A. x  y  Prop | |
| not | Def  A == A   False | 
| Thm*  A:Prop. (  A)  Prop | 
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