Smooth, nonsymplectic embeddings of rational balls in the complex projective plane

preprint2020arXivOpen access

Abstract

We exhibit an infinite family of rational homology balls which embed smoothly but not symplectically in the complex projective plane. We also obtain a new lattice embedding obstruction from Donaldson's diagonalisation theorem, and use this to show that no two of our examples may be embedded disjointly.

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