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A Generalized RSK for Enumerating Linear Series on n-pointed Curves
Gillespie, Maria1; Reimer-Berg, Andrew1
1 Colorado State University Department of Mathematics 1874 Campus Delivery. Fort Collins CO 80523 (USA)
Algebraic Combinatorics, Volume 6 (2023) no. 1, pp. 1-16.

We give a combinatorial proof of a recent geometric result of Farkas and Lian on linear series on curves with prescribed incidence conditions. The result states that the expected number of degree-d morphisms from a general genus g, n-marked curve C to ℙ r , sending the marked points on C to specified general points in ℙ r , is equal to (r+1) g for sufficiently large d. This computation may be rephrased as an intersection problem on Grassmannians, which has a natural combinatorial interpretation in terms of Young tableaux by the classical Littlewood-Richardson rule. We give a bijection, generalizing the well-known RSK correspondence, between the tableaux in question and the (r+1)-ary sequences of length g, and we explore our bijection’s combinatorial properties.

We also apply similar methods to give a combinatorial interpretation and proof of the fact that, in the modified setting in which r=1 and several marked points map to the same point in ℙ 1 , the number of morphisms is still 2 g for sufficiently large d.

Received:
Revised:
Accepted:
Published online:
DOI: 10.5802/alco.250
Classification: 05E14, 05A05, 14N10
Keywords: Young tableaux, RSK algorithm, Schubert calculus, Brill-Noether theory

Gillespie, Maria 1; Reimer-Berg, Andrew 1

1 Colorado State University Department of Mathematics 1874 Campus Delivery. Fort Collins CO 80523 (USA)
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights 
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Gillespie, Maria; Reimer-Berg, Andrew. A Generalized RSK for Enumerating Linear Series on $n$-pointed Curves. Algebraic Combinatorics, Volume 6 (2023) no. 1, pp. 1-16. doi : 10.5802/alco.250. https://alco.centre-mersenne.org/articles/10.5802/alco.250/

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