Abstract
In this paper we study two modifications of the partition lattice, regarding the size of the blocks. After determining the most elementary properties of these lattices, we calculate their Möbius functions, and study the enumeration problems of the chains and maximal length chains in our lattices.






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Notes
There are partitions which cover \(\hat{0}\), but does not satisfy this maximality condition. Take, for example, \(1\,2\,3 | 4\,5\,6\in \mathcal {P}_{\ge 2}(6)\). This element covers \(\hat{0}\), but it contains less than the maximal \(6/2=3\) number of blocks, so a chain \(\hat{0}<1\,2\,3|4\,5\,6<\cdots \) cannot be maximal.
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The authors are grateful to the referees for the detailed comments and corrections that help us to improve the paper.
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The third author was partially supported by Universidad Nacional de Colombia, Project No. 53490.
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Caicedo, J.B., Mező, I. & Ramírez, J.L. Partition Lattice with Limited Block Sizes. Graphs and Combinatorics 38, 146 (2022). https://doi.org/10.1007/s00373-022-02548-1
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DOI: https://doi.org/10.1007/s00373-022-02548-1