Spring **2022 at IIT Gandhinagar**

Assignments

### Logistics

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👤 Instructor: Gadadhar Misra
Contact: gadadhar.misra@iitgn.ac.in

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📌 You can download the course plan here:

MeasureTheoryCoursePlan2022.pdf

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🖇️ **Logistics**

- Lectures: Tuesdays, Wednesdays, Fridays: 10:05AM to 11AM
- Venue:
~~AB 7/104~~ Link to Microsoft Teams (Code: **stf9s7z**)
- Office Hours: open-door policy and appointment by email
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### Course Description

In this course, we develop the theory of Lebesgue integral. We do this after a brief discussion of the limitations of the Riemann integral that the students are expected to have already learnt. First, we must discuss the question of assigning a measure to as large a collection of sets as possible. This done, we introduce the notion of a simple function. We then develop an integration theory due to Lebesgue by approximating functions by simple functions instead of step functions. Applications are plenty, we discuss only the theory of $L_{p}$ spaces and time permitting, the theory of direct integrals.

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### Topics

Semi-algebra, Algebra, Monotone class, Sigma-algebra, Monotone class theorem. Measure spaces, Outline of extension of measures from algebras to the generated sigma-algebras, Measurable sets; Lebesgue Measure and its properties. Measurable functions and their properties; Integration and Convergence theorems. Introduction to $L_{p}$-spaces, Riesz-Fischer theorem; Riesz Representation theorem for $L_{2}$ spaces. Absolute continuity of measures, Radon-Nikodym theorem. Dual of $L_{p}$-spaces, Product measure spaces, Fubini's theorem. Fundamental Theorem of Calculus for Lebesgue Integrals.

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### Course Plan

Week-wise Topic Summary

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### References

- P. R. Halmos, Measure Theory, Springer Verlag, 1979