Quasimodular forms as solutions of Modular differential equations

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We study quasimodular forms of depth ≤4 and determine under which conditions they occur as solutions of modular differential equations. Furthermore, we study which modular differential equations have quasimodular solutions. We use these results to investigate extremal quasimodular forms as introduced by M. Kaneko and M. Koike further. Especially, we prove a conjecture stated by these authors concerning the divisors of the denominators occurring in their Fourier expansion.
Original languageEnglish
Number of pages44
JournalInternational Journal of Number Theory
Publication statusAccepted/In press - 4 Jun 2020


  • math.NT
  • 11F11 34A05

Fields of Expertise

  • Information, Communication & Computing

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