PSEUDO-RIEMANNIAN GEOMERTY,DELTA-INV...

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The book offers a comprehensive introduction to pseudo-Riemannian manifolds and their non-degenerate submanifolds, requiring only basic knowledge of manifold theory. It includes recent findings on these submanifolds. The second part delves into -invariants, a concept introduced by the author in the 1990s to address challenges in relating extrinsic and intrinsic invariants. It also surveys significant developments in this area over the past two decades, highlighting the evolution and impact of -invariants in the field of geometry.