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Counting rational curves with an m-fold point

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arxiv 2212.01664 v2 pith:EMRH6WBZ submitted 2022-12-03 math.AG math.DGmath.SG

Counting rational curves with an m-fold point

classification math.AG math.DGmath.SG
keywords curvesformulapointcountingdegreefoldnumberobtain
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We obtain a recursive formula for the number of rational degree $d$ curves in $\mathbb{CP}^2$ that pass through $3d+1-m$ generic points and that have an $m$-fold singular point. The special case of counting curves with a triple point was solved earlier by other authors. We obtain the formula by considering a family version of Kontsevich's recursion formula, in contrast to the excess intersection theoretic approach of others. A large number of low degree cases have been worked out explicitly.

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