# Journal of the Ramanujan Mathematical Society

Volume 34, Issue 3, September 2019 pp. 365–371.

Angular changes of complex Fourier coefficients of cusp forms

**Authors**:
Mohammed Amin Amri

**Author institution:**ACSA Laboratory, Department of Mathematics, Faculty of Sciences, Mohammed First University, Oujda, Morocco

**Summary: **
In this paper, we investigate the “angular changes” behavior of
some subfamilies of Fourier coefficients of both integral and
half-integral weight holomorphic cusp forms, thus one gets
information about signs of the real an imaginary parts of these
subfamilies. These give an extension of some recent results of
Kohnen and his collaborators.

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