Title CONFORMAL JACOBI OPERATORS OF HYPERSURFACES IN THE DE SITTER SPACE Type of Research Article Keywords de Sitter space, Weyl tensor, Conformally flat space Abstract Classification of the complete spacelike hypersurfaces in the de Sitter space Sn+1 1 (n 4) with commuting Jacobi operators and non-zero index of nullity. Researchers Esmaiel Abedi (First Researcher)