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1 \* Systematic Explicit Mathematics 
2  * [1] F. Feferman: A language and axioms for explicit mathematics.
3  *     Lecture Notes in Mathematics, 450. Springer (1975). pp 87-139. 
4  *\
5
6 \* Development started: 2010 Feb 20 *\
7
8 \graph Z3
9
10 \sorts Prop, Obj, Term