Weerarathna, M. D. M. C. P.; Athapattu, A. M. C. U. M.; Perera, A. A. I.
(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2021-02-17)
In 1912, Geory Birkhoff introduced the chromatic polynomials for planar graphs as a result of solving the four-color problem and Hassler Whitney generalized Birkhoff`s idea for any kind of graphs in 1932. It became one of ...