Contents

  • 131 Editorial Raf Bocklandt
  • 132 Calendar Edward Berengoltz
  • 134 News Edward Berengoltz
  • 137 Mathematics without Frisian nail cheese Hinke Osinga
  • 141 How De Bruijn connected mathematics and art Tom Verhoeff
  • 148 Stochastic interactions Maria Vlasiou
  • 153 What are we selling? Nelly Litvak
  • 158 Again as guinea pigs in a marmot race Wim Caspers
  • 160 Recommendation Parameterized Complexity Investigations Thekla Hamm
  • 162 Mathfest 2025: a math festival for young and old Nicos Starreveld
  • 164 Wim Veldman: an inspiration intuitionistic mathematician Franka Waaldijk, Francien Dechesne
  • 167 A Journey in Scientific Computing Barry Koren
  • 176 Heyting Day 2025: : Symposium in honour of Jaap van Oosten Benno van den Berg, Tom de Jong
  • 179 Community detection: Between heuristics and statistics Martijn Gösgens
  • 184 Chris Klaassen: sharp in mathematics, warm in association Ronald Does, Mathisca de Gunst, Aad van der Vaart
  • 186 Improvement probability and inferior models Rianne de Heide
  • 188 Book reviews Hans Cuypers, Hans Strong, Enna van Dijk