| 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:| ik & kj } |
| | 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 |