# Set theory/Related Articles  Main Article Discussion Related Articles  [?] Bibliography  [?] External Links  [?] Citable Version  [?] A list of Citizendium articles, and planned articles, about Set theory.
See also changes related to Set theory, or pages that link to Set theory or to this page or whose text contains "Set theory".

## Subtopics

• Axiom of choice [r]: Set theory assertion that if S is a set of disjoint, non-empty sets, then there exists a set containing exactly one member from each member of S. [e]
• Boolean algebra [r]: A form of logical calculus with two binary operations AND (multiplication, •) and OR (addition, +) and one unary operation NOT (negation, ~) that reverses the truth value of any statement. [e]
• Cardinality [r]: The size, i.e., the number of elements, of a (possibly infinite) set. [e]
• Power set [r]: The set of all subsets of a given set. [e]
• Set (mathematics) [r]: Informally, any collection of distinct elements. [e]
• Venn diagram [r]: A visual representation of inclusion relations of sets or logical propositions by arrangements of regions in the plane. [e]
• Zermelo-Fraenkel axioms [r]: One of several possible formulations of axiomatic set theory. [e]