Embeddability of arrangements of pseudocircles and graphs on surfaces

É Colin de Verdière, C Medina… - Discrete & …, 2020 - Springer
É Colin de Verdière, C Medina, E Roldán-Pensado, G Salazar
Discrete & Computational Geometry, 2020Springer
A pseudocircle is a simple closed curve on some surface; an arrangement of pseudocircles
is a collection of pseudocircles that pairwise intersect in exactly two points, at which they
cross. Ortner proved that an arrangement of pseudocircles is embeddable into the sphere if
and only if all of its subarrangements of size at most four are embeddable into the sphere,
and asked if an analogous result holds for embeddability into orientable surfaces of higher
genus. We answer this question positively: An arrangement of pseudocircles is embeddable …
Abstract
A pseudocircle is a simple closed curve on some surface; an arrangement of pseudocircles is a collection of pseudocircles that pairwise intersect in exactly two points, at which they cross. Ortner proved that an arrangement of pseudocircles is embeddable into the sphere if and only if all of its subarrangements of size at most four are embeddable into the sphere, and asked if an analogous result holds for embeddability into orientable surfaces of higher genus. We answer this question positively: An arrangement of pseudocircles is embeddable into an orientable surface of genus g if and only if all of its subarrangements of size at most are. Moreover, this bound is tight. We actually have similar results for a much general notion of arrangement, which we call an arrangement of graphs.
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