Characteristic polynomials of digraphs h
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Aiping Deng; Yaokun Wu
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Article
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2005
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Elsevier Science
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English
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Let ฯ be a semi-free action of a group G on a finite digraph . The front divisor /ฯ(ฯ) of has as vertex set the set of the vertex orbits of ฯ and there are t arcs going from ลซ to v in /ฯ(ฯ) if from any vertex u of the orbit ลซ there are t arcs of going towards the vertices in v. Our main result is th