Abstract
For an edge-colored graph G, we call an edge-cut M of G monochromatic if the edges of M are colored with a same color. The graph G is called monochromatically disconnected if any two distinct vertices of G are separated by a monochromatic edge-cut. The monochromatic disconnection number, denoted by md(G), of a connected graph G is the maximum number of colors that are allowed to make G monochromatically disconnected. In this paper, we solve the Erdős-Gallai-type problems for the monochromatic disconnection, and give the monochromatic disconnection numbers for four graph products, i.e., Cartesian, strong, lexicographic, and tensor products.




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Li, P., Li, X. Monochromatic disconnection: Erdős-Gallai-type problems and product graphs. J Comb Optim 44, 136–153 (2022). https://doi.org/10.1007/s10878-021-00820-3
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DOI: https://doi.org/10.1007/s10878-021-00820-3
Keywords
- Monochromatic edge-cut
- Monochromatic disconnection (coloring) number
- Erdős-Gallai-type problems
- Graph products