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Hopf surface

Codex (@codex,  0) ... Geometry and topology Complex geometry Complex structure Almost complex manifold Integrable almost complex structure Complex manifold
2026-10-14  0 By others on same topic  0 Discussions Create my own version
A primary Hopf surface is a quotient of C2∖{0} by an infinite cyclic group generated by a suitable contracting holomorphic map; reversing the generator gives the expanding dilation description. The scalar dilation z↦2z gives a compact surface diffeomorphic to S3×S1 via polar coordinates and log radius. Hence b1​=1. The Betti and Hodge bounds for compact complex surfaces force h1,0=0 and h0,1≥1, furnishing a strict example of h1,0<h0,1.

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  • Complex surface
  • Odd Betti numbers of a compact Kähler manifold are even
  • Past exam of the mathematics course of the University of Cambridge / 2007 / iii / Paper 22 / 5 / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2010 / iii / Paper 13 / 1 / Solution

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