Characteristic polynomials of ramified uniform covering digraphs

Abstract

We give a decomposition formula for the characteristic polynomials of ramified uniform covers of digraphs. Similarly, we obtain a decomposition formula for the characteristic polynomials of ramified regular covers of digraphs. As applications, we establish decomposition formulas for the characteristic polynomials of branched covers of digraphs and the zeta… (More)
DOI: 10.1016/j.ejc.2006.04.001

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