| Some definitions of interest. |
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exteq | Def A =ext B == ( x:A. x B) & ( x:B. x A) |
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int_iseg | Def {i...j} == {k: | i k & k j } |
| | Thm* i,j: . {i...j} Type |
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int_seg | Def {i..j } == {k: | i k < j } |
| | Thm* m,n: . {m..n } Type |
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not | Def A == A  False |
| | Thm* A:Prop. ( A) Prop |
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one_one_corr_2 | Def A ~ B == f:(A B), g:(B A). InvFuns(A;B;f;g) |
| | Thm* A,B:Type. (A ~ B) Prop |