Fourier coefficients of noncongruence cuspforms

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Given a finite index subgroup of SL2(ℤ) with modular curve defined over ℚ, under the assumption that the space of weight k (≥2) cuspforms is one-dimensional, we show that a form in this space with Fourier coefficients in ℚ has bounded denominators if and only if it is a congruence modular form.

Original languageEnglish (US)
Pages (from-to)591-598
Number of pages8
JournalBulletin of the London Mathematical Society
Issue number3
StatePublished - Jun 2012

All Science Journal Classification (ASJC) codes

  • Mathematics(all)


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