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  "body": "\n## Summary\n\nIn graph theory, a **book embedding** is a generalization of [[planar embedding|029JQEK15B]] of a [[graph|00C0BR7D7H]] to embeddings in a *book*, a collection of half-planes all having the same [[line|0MP9BCF6DP]] as their boundary. Usually, the vertices of the graph are required to lie on this boundary line, called the *spine*, and the edges are required to stay within a single half-plane. The **book thickness** of a graph is the smallest possible number of half-planes for any book embedding of the graph. Book thickness is also called **pagenumber**, **stacknumber** or **fixed outerthickness**. Book embeddings have also been used to define several other graph invariants including the pagewidth and book crossing number.\n",
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