Hypersurfaces with constant scalar curvature and two different principal curvatures isometrically immersed in an -dimensional space form M’+1 (C)of constant curvature c and especially in have been extensively investigated within the last four decades. In the present work, we study complete spacelike hypersurfaces with constant scalar curvature and have sectional curvatures in de Sitter space and find a result on the type number of such a hypersurface.
Key words: Hypersurfaces, scalar curvature, type number, primary 53c40, secondary 53c15.
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