Stories about groups and sequences |
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Authors: | Peter J Cameron |
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Institution: | (1) School of Mathematical Sciences, Queen Mary and Westfield College, Mile End Road, E1 4NS London, UK |
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Abstract: | The main theme of this article is that counting orbits of an infinite permutation group on finite subsets or tuples is very closely related to combinatorial enumeration; this point of view ties together various disparate stories. Among these are reconstruction problems, the relation between connected and arbitrary graphs, the enumeration of N-free posets, and some of the combinatorics of Stirling numbers.Dedicated to Hanfried Lenz on the occasion of his 80th birthday. |
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Keywords: | Enumeration permutation group sequence |
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