Definition of set theory in English:
set theory
Syllabification: set the·o·rynoun
 The branch of mathematics that deals with the formal properties of sets as units (without regard to the nature of their individual constituents) and the expression of other branches of mathematics in terms of sets.More example sentences
 He therefore attempted to put set theory on an axiomatic basis to avoid the paradoxes.
 Ernst Schröder's important work is in the area of algebra, set theory and logic.
 In particular, she has attempted to reconcile poetry with set theory, a special branch of algebra.
Derivatives

settheoretic
adjective
 More example sentences
 When Brouwer was beginning his career as a mathematician, settheoretic topology was in a primitive state.
 Later de Groot worked on settheoretic topology.
 It followed that numbertheoretic operations could be explained in terms of settheoretic operations such as intersection, union, and the like.

settheoretical
adjective
 More example sentences
 But whereas the French had analysed settheoretical constructions carried out with the help of the Axiom of Choice, Luzin went considerably further and considered difficulties arising within the theory of effective sets.
 The latter case, where an anaphor refers to the settheoretical difference of restrictor and scope, has been studied by both psycholinguists and formal semanticists.
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