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An $11/6$-Approximation Algorithm for Vertex Cover on String Graphs by Bonnet, Édouard; Rzążewski, Paweł is a scholarly article available to read on EtoBox.

What is An $11/6$-Approximation Algorithm for Vertex Cover on String Graphs about?

We present a 1.8334-approximation algorithm for Vertex Cover on string graphs given with a representation, which takes polynomial time in the size of the representation; the exact approximation factor is $11/6$. Recently, the barrier of 2 was broken by Lokshtanov et al. [SoGC '24] with a 1.9999-approximation algorithm. Thus we increase by three orders of magnitude the distance of the approximation ratio to the trivial bound of 2. Our algorithm is very simple. The intricacies reside in its analysis, where we mainly establish that string graphs without odd cycles of length at most 11 are 8-colorable. Previously, Chudnovsky, Scott, and Seymour [JCTB '21] showed that string graphs without odd cycles of length at most 7 are 80-colorable, and string graphs without odd cycles of length at most 5 have bounded chromatic number.

Author

Bonnet, Édouard; Rzążewski, Paweł

Published

2024

Language

EN