Minimum tree-stretch of Hamming graphs and higher-dimensional grids
Abstract
The minimum stretch spaning tree problem for a grah G is to find a spaning tree T of G such as that the maximum distance in T between two adjacent vertices is minimized. The minimum value of this optimization problem gives rise to a grpah invariant σ T(G) called the tree stretch of G. The problem has been studied in the algorithmic aspects, such as NP-hardness and fixed-parameter solvability. This paper presents the exact values σ T(G) of hamming graphs Kn1 * Kn2 * ... * Knd and the higer-dimensional grids Pn1 * Pn2 * ... * Pnd.
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