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math.CO2025
Positive -divisible non-crossing partitions and their Kreweras maps
Christian Krattenthaler, Christian Stump
We study positive -divisible non-crossing partitions and their positive Kreweras maps. In classical types, we describe their combinatorial realisations as certain non-crossing s…
math.CO2025
Refined enumeration of two-rowed set-valued standard tableaux via two-coloured Motzkin paths
Christian Krattenthaler
We derive formulae for the number of set-valued standard tableaux of two-rowed shapes, keeping track of the total number of entries, the number of entries in the first row, and the…