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G. H. Hardy
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G. H. Hardy

Godfrey Harold Hardy (February 7, 1877December 1, 1947) was a prominent British mathematician, known for his achievements in number theory and mathematical analysis. Non-mathematicians know him for two things: A Mathematician's Apology, his essay from 1941 on the aesthetics of mathematics (ISBN 0521427061) with some personal content — which may be the layman's best insight into the mind of a working mathematician; and his relationship as mentor from 1914 on of the Indian mathematician Srinivasa Ramanujan, whose extraordinary albeit untutored brilliance he immediately recognized. Two less similar mathematicians could hardly be imagined than Hardy, a precise and rigorous atheist, and Ramanujan, an intuitive, mystical Hindu, but they became close friends and colleagues. In an interview by Paul Erdos, when Hardy was asked what his greatest contribution to mathematics was, Hardy unhesitatingly replied that it was the discovery of Ramanujan.

After his schooling at Winchester, Hardy entered Cambridge after standing fourth in the Tripos examination. Years later, Hardy sought to abolish Tripos system as he felt that it was becoming an end in itself than being means to an end. Hardy is also credited of reforming British mathematics by bringing rigor into it, which was previously a characteristic of French, Swiss and German mathematics. British mathematicians were largely in a tradition of applied mathematics, in thrall to the reputation of Isaac Newton; Hardy was in tune with the cours d'analyse methods dominant in France, and aggressively promoted his conception of pure mathematics, in particular against the hydrodynamics which was an important part of Cambridge mathematics.

Hardy was Sadleirian Professor at Cambridge from 1931 to 1942; he had left Cambridge for a chair in Oxford in the aftermath of the Bertrand Russell affair during World War I. From 1911 he collaborated with J.E. Littlewood, in extensive work in mathematical analysis and analytic number theory. This led (along with much else) to quantitative progress on the Waring problem, as part of the Hardy-Littlewood circle method, as it became known. In prime number theory they proved results and some notable conditional results also. This was a major factor in the development of number theory as a system of conjectures; examples are the first and second Hardy-Littlewood conjectures.

He is also known for formulating the Hardy-Weinberg principle, a basic principle of population genetics, independently from Wilhelm Weinberg in 1908. Socially he was associated with the Bloomsbury group and the Cambridge Apostles and was an avid cricket fan.

Hardy never married, and in his final years he was cared for by his sister. He was assessed (self-referentially) by Alan Turing as "just another English intellectual homosexual atheist". Littlewood called him "non-participant homosexual", a judgement supported by C.P. Snow.

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