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Date: 26-4-2022
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If the rank polynomial of a graph is given by , then is the number of subgraphs of with rank and co-rank , and the matrix is called the rank matrix of .
For example, the rank matrix of the complete bipartite graph , which has rank polynomial
(1) |
is given by
(2) |
(Biggs 1993, p. 73), and the rank matrix of the Petersen graph is
(3) |
(Godsil and Royle 2001, p. 356).
Biggs, N. L. Algebraic Graph Theory, 2nd ed. Cambridge, England: Cambridge University Press, p. 73, 1993.
Godsil, C. and Royle, G. Algebraic Graph Theory. New York: Springer-Verlag, 2001.
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