[1196] Recent progress on bounds for sets with no three terms in arithmetic progression
By Sarah Peluse
Also appears in collection : Bourbaki - Juin 2022
A famous conjecture of Erdős states that if $S$ is a subset of the positive integers and the sum of the reciprocals of elements of $S$ diverges, then $S$ contains arbitrarily long arithmetic progressions. If one could prove, for each positive integer $k$, sufficiently good bounds for the size of the largest subset of the first $N$ integers lacking $k$-term arithmetic progressions, then Erdős’s conjecture would follow. There is thus great interest in the problem of proving the strongest possible bounds for sets lacking arithmetic progressions of a fixed length. In this talk, I will survey the recent advances of Bloom–Sisask on this problem for length three progressions and of Croot–Lev–Pach and Ellenberg–Gijswijt on the analogous problem in $F^n_3$ (the "cap set problem"). These two advances rely on very different techniques —Fourier analytic methods and a version of the polynomial method, respectively— and I will give an overview of both.
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