Look upset theory in Wiktionary, the free dictionary.

Set theory is a branch of mathematics concerning mathematical sets. A set theory may also refer to a specific formalization of the mathematics of sets; for a listing of different alternative set theories in this sense, seealternative set theory.

Set theory may also refer to:

• Set theory (music), a theory providing concepts for categorizing musical objects and describing their relationships
• Set Theory: An Introduction to Independence Proofs, a book by Kenneth Kunen

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