Discussiones Mathematicae Graph Theory 17(2) (1997)
229-241

doi: 10.7151/dmgt.1050

John Mitchem

Patrick Morriss

and

Edward Schmeichel

*Department of Mathematics *& Computer Science

San Jose State University, San Jose, California 95192

We consider vertex colorings of graphs in which each color has an associated cost which is incurred each time the color is assigned to a vertex. The cost of the coloring is the sum of the costs incurred at each vertex. The cost chromatic number of a graph with respect to a cost set is the minimum number of colors necessary to produce a minimum cost coloring of the graph. We show that the cost chromatic number of maximal outerplanar and maximal planar graphs can be arbitrarily large and construct several infinite classes of counterexamples to a conjecture of Harary and Plantholt on the cost chromatic number of line graphs.

**Keywords:** cost coloring, outerplanar, planar, line graphs.

**1991 Mathematics Subject Classification:** Primary 05C15, Secondary 05C10.

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