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More than 5000 entries on the history, culture and life of Britain (published in 1993 by Macmillan, now out of print)
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Paul Dirac
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(1902–84) Theoretical physicist who made a major contribution to the development of quantum mechanics. In 1928 he produced a mathematical theory of elementary particles which reconciled quantum mechanics and relativity, and in 1930 he predicted the existence of the positron (later verified experimentally by others). His Principles of Quantum Mechanics (1930) is a classic in the field. He shared the Nobel prize for 1933 with the Austrian Erwin Schrödinger.
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