2 papers
math.CO2005
Knight move for chromatic graph cohomology
Michael Chmutov, Sergei Chmutov, Yongwu Rong
In this paper we prove the knight move theorem for the chromatic graph cohomologies with rational coefficients introduced by L. Helme-Guizon and Y. Rong. Namely, for a connected gr…
math.CO2005
Reduced chromatic graph cohomology
Michael Chmutov, Elena Udovina
In this paper we give a new characterization of the h-vector of the chromatic polynomial of a graph. We introduce reduced chromatic cohomology of a graph and show that h_i are its…