| Some definitions of interest. |
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uni_sat | Def a = !x:T. Q(x) == Q(a) & ( a':T. Q(a')  a' = a) |
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| Thm* T:Type, a:T, Q:(T Prop). (a = !x:T. Q(x)) Prop |
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unique_set | Def {!x:T | P(x)} == {x:T| P(x) & ( y:T. P(y)  y = x) } |
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| Thm* T:Type, P:(T Prop). {!x:T | P(x)} Type |