Full derivations and solutions are obtained for the standard problems of engineering math, mathematical physics, quantum mechanics, and relativity. Topics include the Del operator, gradient, curl, divergence, Fourier series and transforms, integration on the complex plane, matrices, Legendre polynomials, Bessel functions, and Hermite polynomials. This book is a gold mine for students in math-physics and engineering-math. In numerical work, links to Wolfram alpha are included in the eBook. Enjoy learning. This is Volume III of the Tour of Undergraduate Physics series.