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  1. Branch of mathematical logic that studies sets

    Set theory is the branch of mathematical logic that studies sets, which can be informally described as collections of objects. Although objects of any kind can be collected into a set, set theory — as a branch of mathematics — is mostly concerned with those that are relevant to mathematics as a whole.
    en.wikipedia.org/wiki/Set_theory
    en.wikipedia.org/wiki/Set_theory
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  2. 集合论 - 维基百科,自由的百科全书 - zh.wikipedia.org

  3. 集合论 - 维基百科,自由的百科全书

  4. 策梅洛-弗兰克尔集合论 - 维基百科,自由的百科全书

  5. Zermelo–Fraenkel set theory - Wikipedia

  6. Set theory (music) - Wikipedia

  7. 朴素集合论 - 维基百科,自由的百科全书

  8. Set theory - Simple English Wikipedia, the free encyclopedia

  9. Set (mathematics) - Wikipedia

    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 …

  10. General set theory - Wikipedia