Connected numbers and the embedded topology of plane curves

Abstract

The splitting number of a plane irreducible curve for a Galois cover is effective to distinguish the embedded topologies of plane curves. In this paper, we define a connected number of any plane curve for a Galois cover whose branch divisor has no common components with the plane curve, which is similar to the splitting number. We classify the embedded topology of Artal arrangements of degree $b\ge 4$ by the connected number, where an Artal arrangement of degree $b$ is a plane curve consisting of one smooth curve of dgree $b$ and three total inflectional tangents.

12 pages

References in corpus (1)

• On the topology of arrangements of a cubic and its inflectional tangents

Cited by in corpus (2)

• Zariski $N$-ples for a smooth cubic and its tangent lines
• A note on the topology of arrangements for a smooth plane quartic and its bitangent lines