A new proof of a theorem of Mansour and Sun
نویسندگان
چکیده
منابع مشابه
A new proof of a theorem of Mansour and Sun
We give a new proof of a theorem of Mansour and Sun by using number theory and Rothe’s identity. It is well-known that the number of ways of choosing k points, no two consecutive, from a collection of n points arranged on a cycle is n n−k ( n−k k ) (see [11, Lemma 2.3.4]). A generalization of this result was obtained by Kaplansky [5], who proved that the number of k-subsets {x1, . . . , xk} of ...
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ژورنال
عنوان ژورنال: European Journal of Combinatorics
سال: 2008
ISSN: 0195-6698
DOI: 10.1016/j.ejc.2007.11.024