On the number of irreducible coverings b
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Ioan Tomescu
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Article
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1996
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Elsevier Science
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English
β 102 KB
In this paper it is proved that the exponential generating function of the numbers, denoted by N(p, q), of irreducible coverings by edges of the vertices of complete bipartite graphs Kp.q equals exp(xe r + ye x -x -y -xy) -t.