Book embeddings of graphs and a theorem of Whitney
Paul C. Kainen, Shannon Overbay · arXiv (Cornell University) · 2021
It is shown that the number of pages required for a book embedding of a graph is the maximum of the numbers needed for any of the maximal nonseparable subgraphs and that a plane graph in which every triangle bounds a face has a two-page book embedding. The latter extends a theorem of H. Whitney and gives two-page book embeddings for $X$-trees and square grids.