| Some definitions of interest. |
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inhabited_uniquely | Def !A == {x:A| y:A. x = y } |
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int_seg | Def {i..j} == {k:| i k < j } |
| | Thm* m,n:. {m..n} Type |
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inv_funs_2 | Def InvFuns(A;B;f;g) == (x:A. g(f(x)) = x) & (y:B. f(g(y)) = y) |
| | Thm* f:(AB), g:(BA). InvFuns(A;B;f;g) Prop |