Abstract
We prove that a real hypersurface M in a complex space form Mn(c), <TEX>$c{\neq}0$</TEX>, whose Ricci operator and structure tensor commute each other on the holomorphic distribution and the Ricci operator is <TEX>${\eta}-parallel$</TEX>, is a Hopf hypersurface. We also give a characterization of this hypersurface.
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