Applying the mathematical apparatus, in the 1940s, he established the basics of the theory of inhomogeneous anisotropic universe, where he determined specific kinds of all cosmological models — scenarios of evolution — which could be theoretically conceivable for a truly inhomogeneous and anisotropic Universe in the framework of Einstein's theory.
In the 1940s, by employing mathematical techniques, he developed the basics of the theory concerning anisotropic universes. He determined various cosmological models — scenarios of evolution — that could be theoretically conceivable for a truly inhomogeneous and anisotropic Universe within the framework of Einstein's theory.