A brief review on Egmont Köhler's mathematical work (Q1183961)

The paper gives a brief review of Egmont Köhler's work in graph theory and in design theory. In graph theory, his main contributions were to Ringel's Oberwolfach problem, and, more generally, to graph decompositions. In design theory, he studied mainly Steiner systems \(S(t,k,v)\). Here his main contributions were to the existence problem for cyclic Steiner quadruple systems; he also obtained numerical conditions for the parameters of \(S_ \lambda(t,k,v)\) that imply several nonexistence results.