Decomposition of \(K_{13}\) into a torus graph and a graph imbedded in the Klein bottle
In 1959, \textit{G. Ringel} gave a decomposition of \({\mathcal K}_{13}\) into two toroidal graphs. \textit{O. V. Borodin} and \textit{J. Mayer} studied the question whether \({\mathcal K}_{13}\) may be decomposed into a toroidal graph and a graph imbedded in the Klein bottle. In the presented note, there are two independent and different solutions of the problem.
scientific article; zbMATH DE number 64627