Do quasi-isometries between groups always arise from actions on a common model space? Previous counterexamples invoked central extensions of lattices, e.g., of surface groups. A new construction of infinitely many classes is now using amalgams of surface groups. Stark, Woodhouse: Quasi-isometric groups with no common model geometry, https://arxiv.org/pdf/1711.05026.pdf If a group \(\Gamma\) acts geometrically (i.e., … Continue reading "What’s new on the ArXiv: Quasi-isometric groups with no common model geometry"
This blog will eventually be integrated into the website of the DFG priority programme “Geometry at Infinity“. It will discuss all kind of things that might be of potential interest to the users of that website. If you’d like to contribute some shorter or longer article, just send it unformatted or formatted to the e-mail … Continue reading "First blog post"