| Some definitions of interest. |
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eqfun_p | Def IsEqFun(T;eq) == x,y:T. (x eq y) ![](FONT/if_big.png) x = y |
| | Thm* T:Type, eq:(T![](FONT/dash.png) T![](FONT/dash.png) ![](FONT/then_med.png) ). IsEqFun(T;eq) Prop |
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assert | Def b == if b True else False fi |
| | Thm* b: . b Prop |
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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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surject | Def Surj(A; B; f) == b:B. a:A. f(a) = b |
| | Thm* A,B:Type, f:(A![](FONT/dash.png) B). Surj(A; B; f) Prop |