| Some definitions of interest. |
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assert | Def b == if b True else False fi |
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| Thm* b: . b Prop |
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sfa_doc_props_as_types_example1 | Def f zero beyond x == y: . x<y  f(y) = 0  |
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| Thm* x: , f:(   ). f zero beyond x Prop |
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nat | Def == {i: | 0 i } |
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| Thm* Type |
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not | Def A == A  False |
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| Thm* A:Prop. ( A) Prop |
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sfa_doc_even | Def i even == 0= (i rem 2) |
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| Thm* i: . i even  |
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sfa_doc_max_int | Def max(a;b) == if a< b b else a fi |
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| Thm* a,b: . max(a;b)  |