1-Restricted Optimal Rubbling on Graphs

• Main Authors: Beeler Robert A., Haynes Teresa W., Murphy Kyle
• Format: Article
• Language: English
• Published: Sciendo 2019-05-01
• Series: Discussiones Mathematicae Graph Theory
• Subjects: graph pebbling; graph rubbling; optimal rubbling; t-restricted optimal pebbling; 05c78
• Online Access: https://doi.org/10.7151/dmgt.2102

Let G be a graph with vertex set V and a distribution of pebbles on the vertices of V. A pebbling move consists of removing two pebbles from a vertex and placing one pebble on a neighboring vertex, and a rubbling move consists of removing a pebble from each of two neighbors of a vertex v and placing a pebble on v. We seek an initial placement of a minimum total number of pebbles on the vertices in V, so that no vertex receives more than one pebble and for any given vertex v ∈ V, it is possible, by a sequence of pebbling and rubbling moves, to move at least one pebble to v. This minimum number of pebbles is the 1-restricted optimal rubbling number. We determine the 1-restricted optimal rubbling numbers for Cartesian products. We also present bounds on the 1-restricted optimal rubbling number.