Using recent developments on the theory of locally decodable codes, we prove that the critical size for Szemerédi’s theorem with random differences is bounded from above by N1−2/k+o(1) for length-k progressions. This improves the previous best bounds of N1−1 /⌈k/2⌉+o(1) for all odd k.

doi.org/10.37236/12415
Electronic Journal of Combinatorics
Networks
Centrum Wiskunde & Informatica, Amsterdam (CWI), The Netherlands

Briët, J., & Castro-Silva, D. (2024). On the threshold for Szemerédi’s theorem with random differences. Electronic Journal of Combinatorics, 31(4), P4.8:1–P4.8:17. doi:10.37236/12415