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A variant of multiplicity one theorems for half-integral weight modular forms

Volume 190 / 2019

Narasimha Kumar Acta Arithmetica 190 (2019), 75-85 MSC: Primary 11F03, 11F11, 11F37; Secondary 11F30. DOI: 10.4064/aa180123-12-9 Published online: 7 June 2019


We show that the signs of Fourier coefficients on certain subfamilies determine a half-integral weight cuspidal eigenform uniquely up to a constant. We also prove sign change results for the product of Fourier coefficients of two distinct half-integral weight eigenforms.


  • Narasimha KumarDepartment of Mathematics
    Indian Institute of Technology Hyderabad
    Kandi, Sangareddy 502285, India

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