https://ludohirst.me/tags/wombl18/Recent content in WOMBL18 on maths blogHugoen-gbSat, 27 Jun 2026 23:55:44 +0100https://ludohirst.me/blog/wombl_day_2/Sat, 27 Jun 2026 23:55:44 +0100https://ludohirst.me/blog/wombl_day_2/<p>This is our only full day so there is quite a lot to get though. We had three talks before lunch: the first by Akshat Mudgal precenting <a href="https://arxiv.org/abs/2604.25893">A structure theorem for sets with doubling $4 + \delta$</a>, immediately followed by Davi Castro Silva with <a href="https://arxiv.org/abs/2604.04547">An algorithmic Polynomial Freiman-Ruzsa theorem</a>, then the extremely exciting <a href="https://arxiv.org/abs/2605.28781">The sum-product conjecture is false for real numbers</a> given by Thomas Bloom.</p> <p>The talk that was the farthest outside my ken was the second one on PFR- but at least it prompted me into do some reading up on the proofs of the Freiman-Ruzsa theorem, which also plays an important role in Mudgal&rsquo;s paper.</p>https://ludohirst.me/blog/wombl_day_1/Fri, 26 Jun 2026 23:30:00 +0100https://ludohirst.me/blog/wombl_day_1/<p>This year&rsquo;s <a href="https://www.juliawolf.org/seminars/wombl18.shtml">WOMBL</a> is in Ambleside. We got underway today with some introductory activities.</p> <p>As we naturally didn&rsquo;t have any proper talks on the first evening so I&rsquo;ll take the opportunity to expound a little on the mathematical side of the 5 minute speed talk I gave.</p> <h2 id="erdős-szemerédi-1983">Erdős Szemerédi (1983)</h2> <p>[<em>the following section will only be of any interest to those how have already read the paper in question and even then only of very mild interest at best</em>]</p>