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Results tagged with topological-graph-theory
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user 7460
Graph theoretical questions with a topological flavour. For example, graphs on surfaces, spatial embeddings, and geometric graphs. Use the graph-drawing tag for questions specific to graph drawing (e.g. crossing numbers).
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The Klein bottle and the Heawood Conjecture
Denote by $N_c$ the non-orientable surface with $c$ pairwise disjoint crosscaps. So $N_1$ is the projective plane, $N_2$ is the Klein bottle, etc.
Then the "reason" of Klein bottle's exceptionality i …
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