Introduction to the Theory of Relativity by Peter Gabriel Bergmann

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Comprehensive coverage of the special theory (frames of reference, Lorentz transformation, relativistic mechanics of mass points, more), the general theory (principle of equivalence, Riemann-Christoffel curvature tensor, more) and the unified theory (Weyl's gauge-invariant geometry, Kaluza's five-dimensional theory and projective field theories, more.)

Dover Publications, 1976.
ISBN: 9780486632827. 307 pp.
Foreword by Albert Einstein.
Softcover. Very good.