Course Descriptions

16:640:573 - Special Topics Number Theory

Fall 2021 - Henryk Iwaniec

Subtitle:

Sieve Methods

Course Description:

Sieve methods are used for selecting and counting elements of an arithmetic sequence, such as prime numbers or solutions to special diophantine equations. I will present current state of sieve theory (combinatorial sieve, Selberg sieve, large sieve). Recent progress was made by implementation of harmonic analysis (estimates for exponential sums and bilinear forms) which will be included in the course.

Text:

Opera de Cribro, AMS Colloquium Publications, Vol 57, by Friedlander and Iwaniec

Prerequisites:

Knowledge of classical harmonic analysis and skill in complex function theory

*****************************************

PLEASE NOTE:  the course information changes from semester to semester for this course number.  Specifics for each semester below.

Schedule of Sections:

 

Previous Semesters 

Spring 2021 - Henryk Iwaniec

Subtitle:

Equations over Finite Fields

Course Description:

Congruences of prime modulus p for polynomials in several variables can be viewed as equations over the field of p elements. This view point is powerful allowing to work in the field extensions. I will present analytic methods, mostly for algebraic curves, using exponential sums and the theory of L-functions. The highlight of the course will be a proof of the Riemann hypothesis for hyperelliptic curves. Numerous advanced topics will be presented in a survey fashion, in particular the L-functions of algebraic varieties

Text:

Equations over Finite Fields, An Elementary Approach, W.M Schmidt, LNM 536

Prerequisites:

Basic facts of algebra and harmonic analysis

Spring 2018

Henryk Iwaniec

Subtitle:

Diophantine Approximations and Transcendental Numbers

Course Description:

This course concerns two subjects which are closely related: approximations of special numbers by algebraic numbers and theory of transcendental numbers. The main results will be covered in details, in particular :

-Roth theorem

-Baker theory oflinear forms of logarithms

Among several applications I will give a solution of the Gauss Class Number One Problem for imaginary quadratic fields.

No advanced knowledge of number theory is required, but participant's curiosity in special numbers will make the course enjoyable.

Text:

J.W.S. Cassels, An Introduction to Diophantine Approximations, Alan Baker, Transcendental Number Theory

Prerequisites:

None

***************************************************************************************

Fall 2017

Henryk Iwaniec

Subtitle:

Spectral theory of automorphic forms

Course Description:

This will be a one semester course on automorphic forms from analytic point of view. The main topics are:

-spectral decomposition

- trace formula

-sums of Kloosterman sums

-distribution of eigenvalues of the Laplace operator (Weyl’s law, exceptional eigenvalues)

-distribution of Hecke eigenvalues

-hyperbolic lattice point problems

-application to equidistribution of roots of congruences

Text:

Henryk Iwaniec, Spectral Methods of Automorphic Forms, AMS Grad.Stud. Vol.53, 2002

Prerequisites:

Good knowledge of functional analysis and complex function theory will be helpful