Lightlike Submanifolds of Semi-Riemannian Manifolds and Applications by Krishan L. Duggal, Aurel Bejancu.
This book is about the light like (degenerate) geometry of submanifolds needed to fill a gap in the general theory of submanifolds. The growing importance of light like hypersurfaces in mathematical physics, in particular their extensive use in relativity, and very limited information available on t...
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