<p>We show that a function studied by Ramanujan and revisited in a recent paper of Bradley-Thrush in the Ramanujan Journal is closely linked to a Kurokawa-Rovinskiĭ multiple sine. Furthermore we prove that a Ramanujan equality (corrected by Bradley-Thrush) and a similar equality proved by Bradley-Thrush can be obtained, as well as other equalities, by combining a not very well known paper of M. M. Hjortnaes and a long forgotten paper of A. A. Markoff.</p>

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From Ramanujan to Kurokawa–Rovinskiĭ

  • J. -P. Allouche,
  • L. Markov

摘要

We show that a function studied by Ramanujan and revisited in a recent paper of Bradley-Thrush in the Ramanujan Journal is closely linked to a Kurokawa-Rovinskiĭ multiple sine. Furthermore we prove that a Ramanujan equality (corrected by Bradley-Thrush) and a similar equality proved by Bradley-Thrush can be obtained, as well as other equalities, by combining a not very well known paper of M. M. Hjortnaes and a long forgotten paper of A. A. Markoff.