Book:Frederick W. Byron, Jr./Mathematics of Classical and Quantum Physics/Errata

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Errata for 1992: Frederick W. Byron, Jr. and Robert W. Fuller: Mathematics of Classical and Quantum Physics

Dot Product: Einstein Summation Convention

Volume One: Chapter $1$ Vectors in Classical Physics: $1.3$ The Scalar Product:

We shall adopt Einstein's summation convention throughout this chapter. In terms of this convention we have, for example,
$\mathbf x \cdot \mathbf y = x_i y_j \delta_{i j} = x_i y_j = x_j y_j$