On -colorings of nearly bipartite graphs
Let be a simple graph, let denote the degree of a vertex and let be a nonnegative integer function on with for each vertex . A -coloring of is an edge coloring such that for each vertex and each color , there are at least edges colored incident with . The -chromatic index of , denoted by , is the maximum number of colors such that a -coloring of exists. Any simple graph has the -chromatic index equal to or , where . A graph is nearly bipartite, if is not...