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NONEXISTENCE OF RICCI-PARALLEL REAL HYPERSURFACES IN P<sub>2</sub>C OR H<sub>2</sub>C
Niebergall and Ryan posed many open problems on real hypersurfaces in complex space forms. One of them is "Are there any Ricci-parallel real hypersurfaces in complex projective space <TEX>$P_2C$</TEX> or complex hyperbolic space <TEX>$H_2C$</TEX>\ulcorner" The purpose of present paper is to prove the nonexistence of such hypersurfaces.