Titlebook: New Developments in Differential Geometry; Proceedings of the C L. Tamássy,J. Szenthe Conference proceedings 1996 Kluwer Academic Publisher

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Time Inversion in Physics,The aim of my lecture is to give an exact definition of time inversion. The set of time inversions constitute a four dimensional manifold. The subgroup generated by the time inversions is described.

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Prologue

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Geometry of geodesic tubes on Sasakian manifolds,We give a brief survey about some aspects of the geometry of tubes about .-geodesics on Sasakian manifolds. Considering the shape operator and the Ricci operator of these tubes, we characterize Sasakian space forms and locally . -symmetric spaces.

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