Fundamental groups of links of isolated singularities

  • Kapovich M
  • Kollár J
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Abstract

We study fundamental groups of projective varieties with normal crossing singularities and of germs of complex singularities. We prove that for every finitely-presented group G G there is a complex projective surface S S with simple normal crossing singularities only, so that the fundamental group of S S is isomorphic to G G . We use this to construct 3-dimensional isolated complex singularities so that the fundamental group of the link is isomorphic to G G . Lastly, we prove that a finitely-presented group G G is Q {\mathbb Q} -superperfect (has vanishing rational homology in dimensions 1 and 2) if and only if G G is isomorphic to the fundamental group of the link of a rational 6-dimensional complex singularity.

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APA

Kapovich, M., & Kollár, J. (2014). Fundamental groups of links of isolated singularities. Journal of the American Mathematical Society, 27(4), 929–952. https://doi.org/10.1090/s0894-0347-2014-00807-9

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