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  2. List of set identities and relations - Wikipedia

    en.wikipedia.org/wiki/List_of_set_identities_and...

    In the left hand sides of the following identities, is the L eft most set and is the R ight most set. Whenever necessary, both L and R {\displaystyle L{\text{ and }}R} should be assumed to be subsets of some universe set X , {\displaystyle X,} so that L ∁ := X ∖ L and R ∁ := X ∖ R . {\displaystyle L^{\complement }:=X\setminus L{\text ...

  3. Set theory - Wikipedia

    en.wikipedia.org/wiki/Set_theory

    A set is described by listing elements separated by commas, or by a characterizing property of its elements, within braces { }. [8] Since sets are objects, the membership relation can relate sets as well, i.e., sets themselves can be members of other sets. A derived binary relation between two sets is the subset relation, also called set inclusion.

  4. Set (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Set_(mathematics)

    A set of polygons in an Euler diagram This set equals the one depicted above since both have the very same elements.. In mathematics, a set is a collection of different [1] things; [2] [3] [4] these things are called elements or members of the set and are typically mathematical objects of any kind: numbers, symbols, points in space, lines, other geometrical shapes, variables, or even other ...

  5. Cantor's first set theory article - Wikipedia

    en.wikipedia.org/wiki/Cantor's_first_set_theory...

    The table below shows the first five steps of the construction. The table's first column contains the intervals (a n, b n). The second column lists the terms visited during the search for the first two terms in (a n, b n). These two terms are in red. [13]

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  7. Stable roommates problem - Wikipedia

    en.wikipedia.org/wiki/Stable_roommates_problem

    The resulting reduced set of preference lists together is called the Phase 1 table. In this table, if any reduced list is empty, then there is no stable matching. Otherwise, the Phase 1 table is a stable table. A stable table, by definition, is the set of preference lists from the original table after members have been removed from one or more ...

  8. Insurer stocks fall after Trump says 'we're going to knock ...

    www.aol.com/news/insurer-stocks-fall-trump-says...

    CVS Health's Caremark, Cigna's Express Scripts and UnitedHealth Group's Optum control the majority of the U.S. pharmacy benefit market, with their parent companies also operating health insurance ...

  9. Officials say mystery drones are not tracking missing ... - AOL

    www.aol.com/news/officials-mystery-drones-not...

    The shipment was a piece of medical equipment called a pin source, which contains a radioactive component commonly used to calibrate PET scanners. The pin source has since been recovered.