On the D-concircular curvature tensor of a generalized Sasakian-Space-form

The object of this paper is to study of D-concircular curvature tensor on generalized Sasakian-space-forms. Actually we consider generalized Sasakian-space-forms when it is, respectively: D-concircularly flat; D-concircular-pseudosymmetric; D-concircularly Ricci-semisymmetric; D-concircularly symmetric; V (\xi;X) .R = ۰. Most of the main results obtained in this paper are in the form of necessary and sufficient conditions.