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Erwin Finlay-Freundlich
Erwin Finlay-Freundlich FRSE FRAS (; 29 May 1885 – 24 July 1964) was a German astronomer, a pupil of Felix Klein. Freundlich was a working associate of Albert Einstein and introduced experiments for which the general theory of relativity could be tested by astronomical observations based on the gravitational redshift. Life He was born in Biebrich, Germany the son of Friedrich Philipp Ernst Freundlich, a manufacturer, and his wife Elizabeth (Ellie) Finlayson. He was one of seven children, all of whom were raised Protestant, despite their father's Jewish heritage. His elder brother was Herbert Max Finlay Freundlich. He studied locally, leaving school in 1903. He spent 6 months working in the shipyards of Stettin which inspired him to begin studying shipbuilding at the Charlottenburg Polytechnic in Berlin. However he abandoned this in autumn 1905 to instead study Mathematics and Astronomy at Göttingen. Here he studied under Felix Klein and Karl Schwarzschild. In 1913 he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
242 Erwin Freundlich Der Astronom Erwin Freundlich 1
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest composite number, its proper divisors being and . Four is the sum and product of two with itself: 2 + 2 = 4 = 2 x 2, the only number b such that a + a = b = a x a, which also makes four the smallest squared prime number p^. In Knuth's up-arrow notation, , and so forth, for any number of up arrows. By consequence, four is the only square one more than a prime number, specifically three. The sum of the first four prime numbers two + three + five + seven is the only sum of four consecutive prime numbers that yields an odd prime number, seventeen, which is the fourth super-prime. Four lies between the first proper pair of twin primes, three and five, which are the first two Fermat primes, like seventeen, which is the third. On the other hand, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
