Spring 2022 at IIT Gandhinagar



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


<aside> 📌 You can download the course plan here:



<aside> 🖇️ Logistics

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