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We show the existence and Ck,γ smoothness of local integral manifolds at an equilibrium point for nonautonomous and ill-posed equations with sectorially dichotomous operator, provided that the nonlinearities are Ck,γ smooth with respect to the state variable. Ck,γ local unstable integral manifold follows from Ck,γ local stable integral manifold by reversing time variable directly. As an application, an elliptic PDE in infinite cylindrical domain is discussed. [ABSTRACT FROM AUTHOR]