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Hilary D. Brewster, "Relativity"

Preface

The theory of relativity has become a cornerstone of modem physics.

Over the course of time it has been scrutinized in a multitude of

experiments and has always been verified with high accuracy. The

correctness of this theory can no longer be called into question. left after

its discovery by Albert Einstein in 1905, special relativity was only

gradually accepted because it made numerous predictions contradicting

common sense, fervently castigated by Einstein, and also defied

experiment for too long a time. It was only with the advent of particle or

high energy physics that matter could be accelerated to very high

velocities, close to the speed of light, which not only verified special

relativity but also made it a requirement for machine construction.

The book opens with a description of the smooth transition from

Newtonian to Einsteinian behaviour from electrons as their energy is

progressively increased, and this leads directly to the relativistic

expressions for mass, momentum and energy of a particle. The expansion

of the physical research frontier toward astronomy and cosmology during

the past ten to twenty years conSiderably increased the importance of

special relativity and, above all, general relativity based thereupon.

Since astrophysics has in the same time become very popular among

readers with a scientific background, the two theories of relativity have

attained unprecedented publicity. The fascination with astronomy of

children and youths shall only be mentioned incidentally, it is, however,

one of the most impressive features of schools today. This book proceeds

to do just that, offering a radically reoriented presentation of Einstein's

Theory of Relativity that derives Relativity "from" Newtonian ideas, rather

than "in opposition to" them.

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