| 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 ![](FONT/nat.png) |
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injection_type | Def A inj B == {f:(A![](FONT/dash.png) B)| Inj(A; B; f) } |
| | Thm* A,B:Type. A inj B Type |
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int_seg | Def {i..j } == {k: | i k < j } |
| | Thm* m,n: . {m..n } Type |
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nat | Def == {i: | 0 i } |
| | Thm* Type |
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le | Def A B == B<A |
| | Thm* i,j: . (i j) Prop |
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nat_plus | Def ![](FONT/nat.png) == {i: | 0<i } |
| | Thm* ![](FONT/nat.png) Type |
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not | Def A == A ![](FONT/eq.png) False |
| | Thm* A:Prop. ( A) Prop |
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one_one_corr_2 | Def A ~ B == f:(A![](FONT/dash.png) B), g:(B![](FONT/dash.png) A). InvFuns(A;B;f;g) |
| | Thm* A,B:Type. (A ~ B) Prop |