JournalsemVol. 66, No. 2Volume 66, No. 2 (2011) Elemente der Mathematikpp. 45–55Diophantine aspects of the Calkin-Wilf iterationJürgen W. SanderJörn SteudingRasa Steudingpp. 56–62Counting topologiesGerald Kubapp. 63–73Mean distances on a sphereClark Kimberlingpp. 74–82Cyclic polygons in non-Euclidean geometryLienhard Wimmerpp. 83–87Aufgabenp. 88Rezensionen