Church, Charles

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On the orderly listing of permutations 1969 26 D.H. Lehmer states that by an orderly listing of permutations is meant a generation for which it is possible to obtain the k th permutation directly from the number k, and conversely, given a permutation, it is possible to determine at once its rank,...
Linear and circular k-combinations with restrictions 1969 13 For several years problems involving k-combinations of n objects have filled the literature. Most of these have concerned combinations taken on a line, but selections arranged on a circle are also of interest. The aim here is to organize and discuss ...