| Some definitions of interest. |
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trivial_factorization | Def trivial_factorization(z)(i) == if i= z 1 else 0 fi |
| | Thm* a,b: , z:{a..b }. trivial_factorization(z) {a..b }   |
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eq_int | Def i= j == if i=j true ; false fi |
| | Thm* i,j: . (i= j)  |
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nat | Def == {i: | 0 i } |
| | Thm* Type |