
doi: 10.4064/ba63-2-3
Summary: We study integer partitions with respect to the classical word statistics of levels and descents subject to prescribed parity conditions. For instance, a partition with summands \(\lambda_1\geq \cdots \geq \lambda_k\) may be enumerated according to descents \(\lambda_i>\lambda_{i+1}\) while tracking the individual parities of \(\lambda_i\) and \(\lambda_{i+1}\). There are two types of parity levels, \(E=E\) and \(O=O\), and four types of parity-descents, \(E>E\), \(E>O\), \(O>E\) and \(O>O\), where \(E\) and \(O\) represent arbitrary even and odd summands. We obtain functional equations and explicit generating functions for the number of partitions of \(n\) according to the joint occurrence of the two levels. Then we obtain corresponding results for the joint occurrence of the four types of parity-descents. We also provide enumeration results for the total number of occurrences of each statistic in all partitions of \(n\) together with asymptotic estimates for the average number of parity-levels in a random partition.
Combinatorial aspects of partitions of integers, generating function, level, Exact enumeration problems, generating functions, descent, formula, Asymptotic enumeration, partition
Combinatorial aspects of partitions of integers, generating function, level, Exact enumeration problems, generating functions, descent, formula, Asymptotic enumeration, partition
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