Minimum b2 of symplectic fillings of lens spaces
Antony T. H. Fung
Abstract
We classify lens spaces for which the canonical negative-definite plumbing has minimal b2 among all symplectic fillings of the standard contact structure. The classification is given by 4 infinite families of "forbidden subgraphs" in a manner similar to Aceto-McCoy-Park's work on smooth negative-definite fillings of lens spaces. In particular, no classification of this form can be given using a finite list of forbidden configurations, highlighting a difference between symplectic fillings and smooth negative-definite fillings of lens spaces.
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