Chains of maximum length in the tamari lattice

Susanna Fishel, Luke Nelson

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The Tamari lattice Tn was originally defined on bracketings of a set of n+1 objects, with a cover relation based on the associativity rule in one direction. Although in several related lattices the number of maximal chains is known, quoting Knuth, “The enumeration of such paths in Tamari lattices remains mysterious.” The lengths of maximal chains vary over a great range. In this paper, we focus on the chains with maximum length in these lattices. We establish a bijection between the maximum length chains in the Tamari lattice and the set of standard shifted tableaux of staircase shape. We thus derive an explicit formula for the number of maximum length chains, using the Thrall formula for the number of shifted tableaux. We describe the relationship between chains of maximum length in the Tamari lattice and certain maximal chains in weak Bruhat order on the symmetric group, using standard Young tableaux. Additionally, recently Bergeron and Préville-Ratelle introduced a generalized Tamari lattice. Some of the results mentioned above carry over to their generalized Tamari lattice.

Original languageEnglish (US)
Pages (from-to)3343-3353
Number of pages11
JournalProceedings of the American Mathematical Society
Issue number10
StatePublished - Oct 1 2014


  • Maximal chains
  • Shifted tableaux
  • Tamari lattice

ASJC Scopus subject areas

  • Mathematics(all)
  • Applied Mathematics


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