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On a fibre bundle version of the Caporaso-Harris formula

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arxiv 2407.14832 v1 pith:WOLYV65O submitted 2024-07-20 math.AG

On a fibre bundle version of the Caporaso-Harris formula

classification math.AG
keywords caporaso-harriscurvesbundledegreeformulanodalresultalgorithm
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The Caporaso-Harris formula gives a recursive algorithm to enumerate delta nodal degree d curves in P^2. The recursion is obtained in terms of curves of lower degree that are tangent to a given divisor. This paper presents two generalizations of this method. The first result is on enumeration of one cuspidal curves on P^2, and the second result is an extension to the fiber bundle setting. We solve the question of counting the characteristic number planar nodal cubics in P^3 by extending the idea of Caporaso-Harris.

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