Introductory Real Analysis

(Spring 2019)

Summary:

This course continues Analysis II by introducing Lebesgue integration as well as elements of Functional Analysis and Fourier methods in the concrete setting of Lebesgue spaces. The topics include: measurable spaces, Lebesgue measure, Lebesgue integral and its comparison to the Riemann integral, Lp spaces and their properties, functions of bounded variation, absolute continuity, Hilbert spaces, orthonormal systems and Fourier coefficients, Fourier transform.

Contact Information:

Instructor: Igors Gorbovickis

Email: i.gorbovickis@jacobs-university.de

Office: Research I, room 128

Office Hours: TBA

TA: Dzmitry Rumiantsau

Email: d.rumiantsau@jacobs-university.de

Time and Place:

Lectures: Th 8:15-9:45, Fr 11:15-12:30 in East Hall 4

Main textbook:

H. L. Royden and P. M Fitzpatrick, Real analysis, fourth ed., 2010

Additional (optional) textbook:

G.B. Folland, Real Analysis. Modern Techniques and Their Applications. Second edition, 1999

An advanced textbook that includes a detailed exposition of the theory of measure and integration as well as some elements of general topology, functional analysis, Fourier analysis and some other topics.

Grading:

The grade is computed as an averaged percent score with the following weights:

      • Homework: 20%
      • Midterm: 30%
      • Final Exam: 50%

Class Schedule

Th, 07/02/2019: Introduction. Informal motivation for Lebesgue measure and Lebesgue integral. Existence of Lebesgue non-measurable sets. (Section 2.1)

Fr, 08/02/2019: Discussion of the Axiom of Choice. Construction of Lebesgue outer measure. (Section 2.2)

Th, 14/02/2019: The sigma-algebra of Lebesgue measurable sets. Caratheodory's Theorem . (Section 2.3)

Fr, 15/02/2019: HW 1 is due; Abstract definition of measure spaces. Continuity of measures. Borel-Cantelli Lemma. Countable additivity of Lebesgue measure (continuation of Caratheodory's Theorem). (Section 2.5)

Th, 21/02/2019: Sigma-algebra, generated by a set. Borel sigma-algebra. Borel sets are Lebesgue measurable. (Section 2.3)

Fr, 22/02/2019: HW 2 is due; Outer and inner approximation of Lebesgue measure. Cantor set. (Section 2.4, 2.7)

Th, 28/02/2019: Cantor function. Existence of Lebesgue measurable sets that are not Borel. (Section 2.7)

Fr, 01/03/2019: HW 3 is due; Measurable functions and their properties. (Section 3.1)

Th, 07/03/2019: More properties of measurable functions. Pointwise (a. e.) convergence of measurable functions. (Sections 3.1, 3.2)

Fr, 08/03/2019: HW 4 is due; The Simple Approximation Lemma and Theorem. Egoroff's Theorem, Lusin's Theorem. (Sections 3.2, 3.3)

Th, 14/03/2019: Lusin's Theorem. Definition of the Lebesgue Integral. (Sections 3.3, 4.2)

Fr, 15/03/2019: HW 5 is due; Definition of the Lebesgue Integral. Its basic properties. (Sections 4.2-4.4)

Th, 21/03/2019: Basic properties of the Lebesgue Integral (continued). (Sections 4.2-4.4)

Fr, 22/03/2019: HW 6 is due; The Bounded Convergence theorem. Fatou's Lemma; the Monotone Convergence Theorem. The Lebesgue Dominated Convergence Theorem. (Sections 4.2-4.4)

Th, 28/03/2019: Review. Countable additivity and continuity of integration. (Section 4.5)

Fr, 29/03/2019: Midterm; Information for the midterm

Th, 04/04/2019: Midterm review. Absolute continuity of the integral. The Vitali Convergence Theorem. (Section 4.6)

Fr, 05/04/2019: HW 7 is due; The General Vitali Convergence Theorem. Convergence in measure. (Sections 5.1-5.2)

Th, 11/04/2019: Lebesgue's Theorem. Vitali Covering Lemma. (Sections 6.1-6.2)

Fr, 12/04/2019: HW 8 is due; Lebesgue's Theorem. Vitali Covering Lemma. (Sections 6.1-6.2)

---SPRING BREAK---

Th, 25/04/2019: Functions of bounded variation. (Section 6.3)

Fr, 26/04/2019: HW 9 is due; Absolutely continuous functions. (Section 6.4)

Th, 02/05/2019: The Fundamental Theorem of Calculus for absolutely continuous functions. Lebegue decomposition of a function of bounded variation. (Section 6.5)

Fr, 03/05/2019: HW 10 is due; Normed linear spaces. Examples. Lp-spaces. (Section 7.1)

Th, 09/05/2019: Hölder's inequality, Minkowski's inequality and corollaries from them. (Section 7.2)

Fr, 10/05/2019: HW 11 is due; Completeness of Lp-spaces. (Section 7.3)

Th, 16/05/2019: Separability of L-p spaces. Linear functionals. The Riesz Representation Theorem for Lp-spaces (without proof). (Sections 7.4, 8.1)

Fr, 17/05/2019: HW 12 is due; Review.


Final Exam: TBA