• C*-simplicity of HNN extensions and groups acting on trees 

      Bryder, Rasmus Sylvester; Ivanov, Nikolay A.; Omland, Tron (Annales de l'Institut Fourier;volume 70, issue 4, Peer reviewed; Journal article, 2021-04-15)
      We study non-ascending HNN extensions acting on their Bass– Serre tree and characterize C∗-simplicity and the unique trace property by means of the kernel and quasi-kernels of the HNN extension in question. We also present ...