Mathematics – Algebraic Geometry
Scientific paper
2011-03-28
Mathematics
Algebraic Geometry
29 pages, Table 2 corrected, Assumption g=0 added to Theorem 25
Scientific paper
We consider an orbifold Landau-Ginzburg model $(f,G)$, where $f$ is an invertible polynomial in three variables and $G$ a finite group of symmetries of $f$ containing the exponential grading operator, and its Berglund-H\"ubsch transpose $(f^T, G^T)$. We show that this defines a mirror symmetry between orbifold curves and cusp singularities with group action. We define Dolgachev numbers for the orbifold curves and Gabrielov numbers for the cusp singularities with group action. We show that these numbers are the same and that the stringy Euler number of the orbifold curve coincides with the $G^T$-equivariant Milnor number of the mirror cusp singularity.
Ebeling Wolfgang
Takahashi Atsushi
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