"... My wife and I were good friends of the Kahlers and were invited to social gatherings at their home, but we did no…"

"Austrian-born Antoinette von Kahler and her son Erich Kahler (1885–1970) fled Nazi-occupied Germany in 1933. They arr…"

"At Evelyn Place once a fortnight a group of men—the composer Roger Sessions, the mathematician Hermann Weyl, the phil…"

"The theory of relativity is intimately connected with the theory of space and time. I shall therefore begin with a br…"

"It is the essential achievement of the general theory of relativity that it has freed physics from the necessity of i…"

"In May 1921 Albert Einstein delivered a series of lectures at Princeton University on the broad topic of relativity. …"

"Before the development of the theory of relativity it was known the principle of energy and momentum could be express…"

"A material particle upon which no force acts moves, according to the principle of inertia, uniformly in a straight li…"

"Some try to explain Hubble's shift of spectral lines by means other than the Doppler effect. There is, however, no su…"

"A little reflection will show that the law of the equality of the inertial and gravitational mass is equivalent to th…"