On minimal trianglefree graphs with prescribed kdefective chromatic number
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Authors
Achuthan, Nirmala
Achuthan, Narasimaha
Simanihuruk, M.
Date
2011Type
Journal Article
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A graph G is (m, k)colourable if its vertices can be coloured with m colours such that the maximum degree of any subgraph induced on vertices receiving the same colour is at most k. The kdefective chromatic number χk(G) is the least positive integer m for which G is (m, k)colourable. Let f(m, k) be the smallest order of a trianglefree graph such that χk(G)=m. In this paper we study the problem of determining f(m, k). We show that f(3, 2)=13 and characterize the corresponding minimal graphs. We present a lower bound for f(m, k) for all m≥3 and also an upper bound for f(3, k).
Citation
Achuthan, Nirmala and Achuthan, N.R. and Simanihuruk, M. 2011. On minimal trianglefree graphs with prescribed kdefective chromatic number. Discrete Mathematics. 311 (13): pp. 11191127.
Source Title
Discrete Mathematics
Department
Department of Mathematics and Statistics
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