shadows, and only a kind of union of the two will preserve an independent reality.

In three-dimensional Euclidean space, the line element (the distance between neighbouring points in space) is ds, where

The fact that spacetime can be thought of as a four-dimensional Euclidean space with ict as one of the coordinates led Minkowski to the 'mystic formula', 3 x 105 km = 1 s, which I leave the reader to ponder at his or her leisure!

The question of who should receive the credit for the creation of special theory has been the subject of some controversy. In 1953, Sir Edmund Whittaker published a review of the subject under the title The Relativity Principle of Poincare and Lorentz, and many authors since then have claimed that Einstein's contribution was simply to bring together various ideas that were in the public

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