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* [[جبر على مجموعة]] Algebra over a set ...]]s which are the group of integers [[modular arithmetic|modulo]] ''n''. [[Set theory]] is a branch of [[logic]] and not technically a branch of algebra.

...A intersect B.svg|thumb|200px|يسار|[[Venn diagram]]s are illustrations of set theoretical, mathematical or logical relationships.]] ...] is the foundation which underlies [[mathematical logic]] and the rest of mathematics. It tries to formalize valid reasoning. In particular, it attempts to defin

'''نظرية الفئات''' أو '''نظرية المجموعات''' '''Set theory''' طريقة لحل مسائل [[رياضيات|الرياضيات] {{portal|Set theory|Venn0001.svg}}