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Colorful induced subgraphs
1992
Discrete Mathematics
Kierstead, H.A. and W.T. Trotter. Colorful induced subgraphs, Discrete Mathematics 101 (1992) 165-169. A colored graph is a graph whose vertices have been properly, though not necessarily optimally colored, with integers. Colored graphs have a natural orientation in which edges are directed from the end point with smaller color to the end point with larger color. A subgraph of a colored graph is colorful if each of its vertices has a distinct color. We prove that there exists a function f (k,
doi:10.1016/0012-365x(92)90600-k
fatcat:cqqir6eq2bhkbn533na4ualy3u