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 ...