Combinatorial Perspectives on the Crank and Mex Partition Statistics

Brian Hopkins, James A. Sellers, Ae Ja Yee

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Several authors have recently considered the smallest positive part missing from an integer partition, known as the minimum excludant or mex. In this work, we revisit and extend connections between Dyson’s crank statistic, the mex, and Frobe-nius symbols, with a focus on combinatorial proof techniques. One highlight is a generating function expression for the number of partitions with a bounded crank that does not include an alternating sum. This leads to a combinatorial interpreta-tion involving types of Durfee rectangles. A recurring combinatorial technique uses sign reversing involutions on certain triples of partitions to establish a result of Fine and other identities.

Original languageEnglish (US)
Article numberP2.11
JournalElectronic Journal of Combinatorics
Issue number2
StatePublished - 2022

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • Geometry and Topology
  • Discrete Mathematics and Combinatorics
  • Computational Theory and Mathematics
  • Applied Mathematics


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