Nadeem Ansari, R S Chandel, Rizwana Jamal


The b-chromatic number 𝜑(𝐺) of a graph 𝐺 is the greatest integer k such that 𝐺 admits a proper k-coloring in which every color class 𝑖 has a vertex realizing color 𝑖 that is proficient to correspond with all the others color classes. The paper estimates the 𝑏-chromatic number of helm graph, central graph of helm graph and middle graph of helm graph which is denoted by Hn, C(Hn) and 𝑀(Hn) respectively.


b-chromatic number; Helm graph; Central graph; Middle graph

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