One common type of DBMS is known as a relational DBMS in which stored information appears to the user as a set of tables, each of which is termed a relation. In each relation, the information is arranged in rows and columns, with columns of data being related to each other by one or...
The treewidth of Gk is at least k, by Lucena's theorem: it has an MCS-ordering with maximum visited degree k. Let Gk′ be the graph obtained by removing the vertex on layer k from Gk. As the vertex on layer k is a simplicial vertex of degree two, the treewidth of Gk is the ...