Set Theory

Last Updated : 11 May, 2026

Set theory is a branch of mathematics that deals with collections of objects, called sets. A set is simply a collection of distinct elements, such as numbers, letters, or even everyday objects, that share a common property or rule.

Example of Sets

  • A set of fruits: {apple, banana, orange}
  • A set of numbers: {1, 2, 3, 4}
  • A set of even numbers: {2, 4, 6, 8, 10, ....}
  • A set of months with exactly 6 Sundays: {∅}. This set is empty, as no month has exactly 6 Sundays.

Key Concepts in Set Theory

This section introduces the basics of Set Theory, helping you understand key concepts like types of sets, set operations, and important formulas through clear examples and symbols.

Advanced Topics of Set Theory

This part covers advanced Set Theory concepts like Cartesian products, relations, and functions, helping you learn how sets connect and interact in more complex ways.

Practice for Set Theory

This section offers solved questions, quizzes, and practice problems to help you strengthen your understanding of Set Theory and master set operations.

Programs of Set Theory

This section shows how to work with sets in different programming languages like C++, Python, C#, and JavaScript, using built-in set data structures and operations.

Standard Problems Associated with Set Data Structure

This section covers common set-based problems in data structures, helping you solve tasks like finding unions, intersections, removing duplicates, and more using sets.

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