After receiving his PhD in 1967, Günter Ludyk habilitated and has been appointed "Scientific Advisor and Professor" (associate professor) of the Technical University of Berlin in 1970. In  1971 he has been a visiting professor at the Technical University of Graz/Austrial. Since 1972 he is a Full Professor at the Physics/Electrical Engineering Faculty of the University of Bremen. His area of research includes the theory of dynamical systems and the application of interval mathematics to generate high-precision results. He published various books on these topics both in German and English, e. g.  "Time-Variant Discrete-Time-Systems" in 1981 and "Stability of Time-Variant Discrete-Time Systems" in 1985.

Special Relativity.-  The Galilei Transformation.- The Lorentz Transformation.- The Invariance of Quadratic Forms.- Velocity Addition.- Lorentz Transformation of Velocities.- Lorentz Transformation of Impulses.- Acceleration and Force.- Relativistic Electrodynamics.- Energy Momentum Matrix.- General Relativity.- General Relativity and Riemannian Geometry.- Some Mathematics: Derivation of a function, vector, and matrix with respect  to time.- Motion in a Gravity Field.- Geodesic Path.- Exampel: Rotating System.- General Transformations of Coordinates.- Some Differential Geometry.- Parallel Displacement.- Riemannian Curvature Matrix.- Properties of the Riemannian Curvature Matrix.- The Ricci Matrix and its Properties.- General Theory of Gravitation.- Summary.- Hilbert Functional.- Gravitation of a Spherical Body.- Schwarzschild Solution.- The Influence of a Body upon its Vicinity.- The Interior Schwarzschild Solution.- Black Holes.- Rotating Masses.

This book is an introduction to the theories of Special and General Relativity. The target audience are physicists, engineers and applied scientists who are looking for an understandable introduction to the topic - without too much new mathematics. The fundamental equations of Einstein's theory of Special and General Relativity are derived using matrix calculus, without the help of tensors. This feature makes the book special and a valuable tool for scientists and engineers with no experience in the field of tensor calculus. In part I the foundations of Special Relativity are developed, part II describes the structure and principle of General Relativity. Part III explains the Schwarzschild solution of spherical body gravity and examines the "Black Hole" phenomenon. Any necessary mathematical tools are user friendly provided, either directly in the text or in the appendices.