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Giants of Physics

Paul Dirac

The physics of the future, of course, cannot have the three quantities h-bar, e and c all as fundamental quantities. Only two of them can be fundamental, and the third must be derived from those two. It is almost certain that c will be one of the two fundamental ones. The velocity of light, c, is so important in the four-dimensional picture, and it plays such a fundamental role in the special theory of relativity, correlating our units of space and time, that it has to be fundamental.

I think one is on safe ground if one makes the guess that in the physical picture we shall have at some future stage e and c will be fundamental quantities and h-bar will be derived


The Einstein-Freud Correspondence (1931-1932)