“…A tree-partition is a T-partition for some tree T. The tree-partition-width 3 of G, denoted by tpw(G), is the minimum width of a tree-partition of G. Thus tpw(G) = tpw 1 (G), which equals the minimum ∈ N 0 for which G is contained in T K for some tree T. Tree-partitions were independently introduced by Seese [69] and Halin [39], and have since been widely investigated [7,8,19,20,24,34,76,77]. Applications of tree-partitions include graph drawing [13,16,30,32,80], nonrepetitive graph colouring [2], clustered graph colouring [1], monadic second-order logic [51], network emulations [4,5,9,37], size Ramsey number [26,43], statistical learning theory [81], and the edge-Erdős-Pósa property [14,38,60]. Planar-partitions and other more general structures have also been studied [18,21,22,63,80].…”