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/seL4-l4v-10.1.1/HOL4/examples/set-theory/zfset/
H A DzfsetScript.sml558 val _ = new_binder("Us",``:(num -> zfset) -> zfset``);
562 `$Us s = UU(Image (s o Num2num) Num)`;
567 ``!s x. x In ($Us s) = ?n. x In s n``,
581 ``!s1 s2. (Us n. s1 n U s2 n) = (Us n. s1 n) U (Us n. s2 n)``,

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