| Some definitions of interest. |
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factorial_tail_via_iter | Def k!m == i:{k-m..k }. i+1 |
| | Thm* m,k: . k!m  |
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iter_via_intseg | Def Iter(f;u) i:{a..b }. e(i)
Def == if a< b f((Iter(f;u) i:{a..b-1 }. e(i)),e(b-1)) else u fi
Def (recursive) |
| | Thm* f:(A A A), u:A, a,b: , e:({a..b } A). (Iter(f;u) i:{a..b }. e(i)) A |
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nat | Def == {i: | 0 i } |
| | Thm* Type |
|
le | Def A B == B<A |
| | Thm* i,j: . (i j) Prop |