Krishan L. Duggal Books

Symmetries of Spacetimes and Riemannian Manifolds
Symmetries of Spacetimes and Riemannian Manifolds

By Krishan L. Duggal, Ramesh Sharma

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This book provides up-to-date information on metric (i.e. Killing, homothetic and conformal), connection (i.e. affine, conformal and projective), curvature collineations and curvature inheritance s...

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Lightlike Submanifolds of Semi Riemannian Manifolds and Applications
Lightlike Submanifolds of Semi Riemannian Manifolds and Applications

By Krishan L. Duggal, Aurel Bejancu

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This book has been written with a two-fold approach in mind: firstly, it adds to the theory of submanifolds the missing part of lightlike (degenerate) submanifolds of semi-Riemannian manifolds, and...

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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