Weighted divisor sums and Bessel function series, II

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On page 335 in his lost notebook, Ramanujan recorded without proofs two identities involving finite trigonometric sums and doubly infinite series of Bessel functions. In each case, there are three possible interpretations for the double series. In an earlier paper, two of the present authors proved the first identity under one possible interpretation. In the present paper, the second identity is proved under a similar interpretation, with one additional assumption. Moreover, under a second interpretation, entirely different proofs of both identities, depending on weighted (or twisted) divisor sums, are offered. The two identities are intimately connected with the classical circle and divisor problems, respectively.

Original languageEnglish (US)
Pages (from-to)2055-2097
Number of pages43
JournalAdvances in Mathematics
Issue number3
StatePublished - Feb 15 2012


  • Bessel functions
  • Circle problem
  • Divisor problem
  • Fourier series
  • Ramanujan's lost notebook
  • Trigonometric sums
  • Weighted divisor sums

ASJC Scopus subject areas

  • Mathematics(all)


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