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Absolute and relative Gromov-Witten invariants of very ample hypersurfaces

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arxiv math/9908054 v1 pith:72ELZJ5D submitted 1999-08-12 math.AG

Absolute and relative Gromov-Witten invariants of very ample hypersurfaces

classification math.AG
keywords invariantsgromov-wittenrelativeamplegenussmoothveryzero
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For any smooth complex projective variety X and smooth very ample hypersurface Y in X, we develop the technique of genus zero relative Gromov-Witten invariants of Y in X in algebro-geometric terms. We prove an equality of cycles in the Chow groups of the moduli spaces of relative stable maps that relates these relative invariants to the Gromov-Witten invariants of X and Y. Given the Gromov-Witten invariants of X, we show that these relations are sufficient to compute all relative invariants, as well as all genus zero Gromov-Witten invariants of Y whose homology and cohomology classes are induced by X.

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    A chamber decomposition of tangency conditions for log stable maps to toric surfaces makes the Grothendieck class of the moduli space constant within chambers defined by fixed cyclic orderings.