Discrete Mathematics
Repeated angles in the plane and related problems
Journal of Combinatorial Theory Series A
A generalization of Vizing's theorem on domination
Discrete Mathematics
Discrete Mathematics
Approximating the spanning star forest problem and its applications to genomic sequence alignment
SODA '07 Proceedings of the eighteenth annual ACM-SIAM symposium on Discrete algorithms
Dminating sets for outerplanar graphs
Math'04 Proceedings of the 5th WSEAS International Conference on Applied Mathematics
On the approximability of the Maximum Agreement SubTree and Maximum Compatible Tree problems
Discrete Applied Mathematics
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A star forest of a graph G is a spanning subgraph of G in which each component is a star. The minimum number of edges required to guarantee that an arbitrary graph, or a bipartite graph, has a star forest of size n is determined. Sharp lower bounds on the size of a largest star forest are also determined. For bipartite graphs, these are used to obtain an upper bound on the domination number in terms of the number of vertices and edges in the graph, which is an improvement on a bound of Vizing. In turn, the results on bipartite graphs are used to determine the minimum number of lattice points required so that there exists a subset of n lattice points, no three of which form a right triangle with legs parallel to the coordinate axes.