We present a rough classification of differential forms on a Riemannian manifold, we consider definitions and properties of conformal Killing forms on a compact Riemannian manifold and define Tachibana numbers as an analog of the well known Betti numbers. We state the conditions that characterize these numbers. In the last section we show connections between the Betti and Tachibana numbers.
机构:
Department of Mathematics, Financial Academy under the Government of the Russian FederationDepartment of Mathematics, Financial Academy under the Government of the Russian Federation