Geodesic
On the Isometric Path Partition Problem
Discussiones Mathematicae. Graph Theory, Tome 41 (2021) no. 4, pp. 1077-1089

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The isometric path cover (partition) problem of a graph consists of finding a minimum set of isometric paths which cover (partition) the vertex set of the graph. The isometric path cover (partition) number of a graph is the cardinality of a minimum isometric path cover (partition). We prove that the isometric path partition problem and the isometric k-path partition problem for k 3 are NP-complete on general graphs. Fisher and Fitzpatrick in [The isometric number of a graph, J. Combin. Math. Combin. Comput. 38 (2001) 97–110] have shown that the isometric path cover number of the (r × r)-dimensional grid is ⌈2r/3 ⌉. We show that the isometric path cover (partition) number of the (r × s)-dimensional grid is s when r s(s − 1). We establish that the isometric path cover (partition) number of the (r × r)-dimensional torus is r when r is even and is either r or r + 1 when r is odd. Then, we demonstrate that the isometric path cover (partition) number of an r-dimensional Benes network is 2r. In addition, we provide partial solutions for the isometric path cover (partition) problems for cylinder and multi-dimensional grids. We apply two di erent techniques to achieve these results.
Keywords: path cover problem, isometric path partition problem, isometric path cover problem, multi-dimensional grids, cylinder, torus 
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Manuel, Paul. On the Isometric Path Partition Problem. Discussiones Mathematicae. Graph Theory, Tome 41 (2021) no. 4, pp. 1077-1089. http://geodesic.mathdoc.fr/item/DMGT_2021_41_4_a13/