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.

• From the Contents: 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.

From the book reviews: "Addressing physicists, applied scientists and engineers with no previous knowledge of tensor calculus, Ludyk ... presents in a well-written manner a rather easy introduction to special as well as general relativity by solely using matrix calculus and elementary differential geometry. ... It is more than certain that Ludyk's treatment will make it possible for a larger number of students to get acquainted with special and general relativity theory at an introductory, undergraduate level." (Theophanes Grammenos, Mathematical Reviews, April, 2014) "The main audience for this book can be ... those who have experience with practical calculations by use of matrices and vectors, but who have not the time to become familiar with tensor calculus. ... this book presents essentially all ingredients what one expects from a book aimed to introduce special and general relativity ... ." (Hans-Jurgen Schmidt, zbMATH, Vol. 1272, 2013)