What does "set theory" mean?

The mathematical theory of sets.

Set theory

Common synonyms include: analysis, arithmetic, axiomatic set theory, categorization practice, dialectic, dialectics.

noun

noun ·Rare ·Advanced level

Noun

1
The mathematical theory of sets. uncountable, usually
"We mentioned previously that certain paradoxes in set theory arose shortly after Cantor's works were published."
2
the branch of pure mathematics that deals with the nature and relations of sets wordnet
3
A systematic approach to describing musical objects and their relationships. uncountable, usually

"We mentioned previously that certain paradoxes in set theory arose shortly after Cantor's works were published."