![]() Seminorms with low entropy are ones for which inverse theorems can be expected to be a useful tool. Accordingly, let us define the -entropy of the seminorm to be the least cardinality of for which such an inverse theorem holds. There is some flexibility in exactly how to choose the class of structured functions, but intuitively an inverse theorem should become more powerful when this class is small. Informally, one should think of as being somewhat small but fixed independently of, as being somewhat smaller but depending only on (and on the seminorm), and as representing the “structured functions” for these choices of parameters. Theorem 1 (Inverse theorem template) If is a -bounded function with, then there exists such that, where denotes the usual inner product In additive combinatorics, a significant role is played by inverse theorems, which abstractly take the following form for certain choices of seminorm, some parameters, and some class of -bounded functions: All seminorms in this post will be implicitly assumed to obey this property. There are many seminorms of interest that one places on functions that are bounded by on -bounded functions, such as the Gowers uniformity seminorms for (which are genuine norms for ). Let us define a -bounded function to be a function such that for all. Let be a finite set of order in applications will be typically something like a finite abelian group, such as the cyclic group. EDIT: I’d also like to point out the Short Communications Satellite (which just opened its poster room) and the World Meeting for Women in Mathematics (which just concluded, but has all of its talks online, and also awarded the inaugural Ladyshenskaya prize to Svetlana Jitormiskaya).Īfter the virtual ICM concludes, I will solicit feedback on this blog (in my capacity as chair of the IMU Structure Committee) on all aspects of that congress, as well as suggestions for future congresses but I am not formally requesting such feedback at this present time. There are also a number of other virtual ICM satellite events that are being held either simultaneously with, or close to, the virtual ICM I would like to draw particular attention to the satellite public lectures by Williamson (July 8), Giorgi (July 11), and Tokieda (July 13), which was also highlighted in my previous blog post. We have an unofficial ICM Discord server set up to follow the virtual ICM as it happens, with events set up for the prize ceremony and individual days of the congress, as well as for individual sections, as well as more recreational channels, such as a speculation page for the IMU prize winners. (Due to high demand, registration for the virtual ICM has unfortunately reached the capacity of the live platform but lectures will be made available on the IMU Youtube channel a few hours after they are given.) The virtual ICM program will begin the day after the award ceremony, beginning with the lectures of the prize laureates. Event information can be found at this Facebook Event page, and will also be streamed at this Youtube page participants who have registered at the virtual ICM can also view it from the web page links they would have received in email in the last few days. Tomorrow the IMU award ceremony will take place, where the recipients of the various IMU awards (such as the Fields medal) will be revealed and honored. In particular the assembly voted on the location of the 2026 ICM it will be held in Philadelphia, USA (with the general assembly being held in New York, USA). I’m currently in Helsinki, Finland for the General Assembly meeting of the International Mathematical Union (IMU), which runs the International Congress of Mathematicians (ICM) as well as several other events and initiatives.
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