Elementary Introduction to the Lebesgue Integral is not just an excellent primer of the Lebesgue integral for undergraduate students but a valuable tool for tomorrow’s mathematicians. Since the early twentieth century, the Lebesgue integral has been a mainstay of mathematical analysis because of its important properties with respect to limits. For this reason, it is vital that mathematical students properly understand the complexities of the Lebesgue integral. However, most texts about the subject are geared towards graduate students, which makes it a challenge for instructors to properly teach and for less advanced students to learn.

Ensuring that the subject is accessible for all readers, the author presents the text in a clear and concrete manner which allows readers to focus on the real line. This is important because Lebesgue integral can be challenging to understand when compared to more widely used integrals like the Riemann integral. The author also includes in the textbook abundant examples and exercises to help explain the topic. Other topics explored in greater detail are abstract measure spaces and product measures, which are treated concretely.


  • Comprehensibly written introduction to the Lebesgue integral for undergraduate students
  • Includes many examples, figures and exercises
  • Features a Table of Notation and Glossary to aid readers
  • Solutions to selected exercises


chapter 1|18 pages

Introductory Thoughts

chapter 2|5 pages

The Purpose of Measures

chapter 3|10 pages

The Leuesgue Integral

chapter 4|8 pages

Integrable Functions

chapter 5|9 pages

The Lebesgue Spaces

chapter 6|6 pages

The Concept of Outer Measure

chapter 7|9 pages

What Is a Measurable Set?

chapter 8|13 pages

Decomposition Theorems

chapter 9|14 pages

Creation of Measures

chapter 10|6 pages

Instances of Measurable Sets

chapter 11|6 pages

Approximation by Open And Closed Sets

chapter 12|8 pages

Different Methods of Convergence

chapter 13|8 pages

Measure on a Product Space

chapter 14|4 pages

Additivity for Outer Measure

chapter 15|5 pages

Nonmeasuraule Sets and Non‐Borel Sets

chapter 16|5 pages