Multiplicative functions (Kuwait Lecture)

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• K. Soundararajan (Stanford)
• Tuesday 13 March 2007, 17:00-18:00
• MR2, CMS.

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A multiplicative function f: N → C is a function satisfying f(mn)=f(m)f(n). Many naturally occuring functions in number theory are multiplicative. Over the last several years, Andrew Granville and I have been studying various features of multiplicative functions. I will discuss some aspects of this work. For example, I will answer the question of how many numbers up to a given number x are quadratic residues (you are free to choose the prime p so as to minimize the answer). As another example, I will discuss character sums and a recent improvement of a classical inequality of Pólya and Vinogradov.

This talk is part of the Discrete Analysis Seminar series.

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