Obstructions of Connectivity Two for Embedding Graphs into the Torus
Bojan Mohar, Petr Škoda · Canadian Journal of Mathematics · 2014
Abstract The complete set of minimal obstructions for embedding graphs into the torus is still not determined. In this paper, we present all obstructions for the torus of connectivity 2. Furthermore, we describe the building blocks of obstructions of connectivity 2 for any orientable surface.