| 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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fun_over_st | Def x:A st P(x) B(x) == x:{x:A| P(x) } B(x) |
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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 |