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 N 1 − 2 k + o (1) for length- k progressions. This improves the previous best bounds of N 1 − 1 d k/ 2 e + o (1) for all odd k.

doi.org/10.5817/CZ.MUNI.EUROCOMB23-032
Networks
12th European Conference on Combinatorics, Graph Theory and Applications, EUROCOMB'23
Algorithms and Complexity

Briët, J., & Castro-Silva, D. (2023). Raising the roof on the threshold for Szemerédi‘s theorem with random differences. In Proceedings of the 12th European Conference on Combinatorics, Graph Theory and Applications, EUROCOMB'23 (pp. 231–237). doi:10.5817/CZ.MUNI.EUROCOMB23-032