HEEGNER POINTS, CYCLES AND MAASS FORMS

We derive for Hecke-Maass cusp forms on the full modular group a relat ion between the sum of the form st Heegner points (and integrals over Heegner cycles) and the product of two Fourier coefficients of a corre sponding form of half-integral weight. Specializing to certain cycles we obtain the non-negativity of the L-function of such a form at the c enter of the critical strip. These results generalize similar formulae known for holomorphic forms.