Asymptotic Enumeration of Non-crossing Partitions on Surfaces

We generalize the notion of non-crossing partition on a disk to general surfaces with boundary. For this, we consider a surface Σ and introduce the number CΣ(n) of noncrossing partitions of a set of n points laying on the boundary of Σ. Our proofs use bijective techniques arising from map enumeration, joint with the symbolic method and singularity analysis on generating functions. An outcome of our results is that the exponential growth of CΣ(n) is the same as the one of the n-th Catalan number, i.e., does not change when we move from the case where Σ is a disk to general surfaces with boundary.

• Type: Journal
• Year: 2011
• Where: CORR
• Authors: Juanjo Rué, Ignasi Sau, Dimitrios M. Thilikos
• Keywords: CORR 2011, Education, N-th Catalan Number, Non-crossing Partition, Symbolic Method