The Sign of Fourier Coefficients of Half-Integral Weight Cusp Forms

Thomas A. Hulse, E. Mehmet Kiral, Chan Ieong Kuan +1

From a result of Waldspurger, it is known that the normalized Fourier coefficients $a(m)$ of a half-integral weight holomorphic cusp eigenform $\f$ are, up to a finite set of facto…