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typo
Richard Borcherds
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The logarithmic derivative of the η function is the Eisenstein series G2, up to elementary factors. The series for G2 does not quite converge when summed over a lattice, but can be regularized in various ways so that it does converge.

Richard Borcherds
  • 20.7k
  • 9
  • 97
  • 113