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On accumulation points of volumes of stable surfaces with one cyclic quotient singularity

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arxiv 2107.01317 v1 pith:A6T4DY2Z submitted 2021-07-03 math.AG

classification math.AG
keywords stablesurfacesaccumulationcyclicpointsquotientsingularityvolumes
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The set of volumes of stable surfaces does have accumulation points. In this paper, we study this phenomenon for surfaces with one cyclic quotient singularity, towards answering the question under which conditions we can still have boundedness. Effective bounds allow listing singularities that might appear on a stable surface after fixing its invariants. We find optimal inequalities for stable surfaces with one cyclic quotient singularity, which can be used to prove boundedness under certain conditions. We also introduce the notion of generalized T-singularity, which is a natural generalization of the well-known T-singularities. By using our inequalities, we show how the accumulation points of volumes of stable surfaces with one generalized T-singularity are formed.

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