This talk on Integration was held on Friday October 28, 2016 in MC 4020. The talk was given by Gregory Patchell.

## Abstract

The first part of this talk will be concerned with a brief introduction to measure theory. We will answer questions such a: How do we measure sets? Can every set be measured?

The second part of this talk will be the construction of the Lebesgue integral along with basic properties of the Lebesgue integral, along with comparisons to Riemann integration as we go. From Math 148, we saw that pointwise convergence doesn’t play well with Riemann integration. We will see that with the powerful Monotone Convergence Theorem and the Dominated Convergence Theorem, pointwise convergence and Lebesgue integration are a match made in heaven.

### Outline

Definitions and examples of σ-algebras, measures, and measurable functions

Motivations for Lebesgue integrals

Construction of the Lebesgue integral with comparison to construction of the Riemann integral

Benefits and properties of Lebesgue integration and limitations of Riemann integration

Limitations of Lebesgue Integration

Probability Spaces

Vitali Sets