Leonhard Euler 


He was involved in work to solve the greatest problem of the age  the Longitude problem  and is regarded by some as the most prolific mathematician ever to have lived.
Others dispute that, pointing instead at Paul Erdos, but while Erdos published more papers, Euler published more pages. PierreSimon Laplace said: "Read Euler, read Euler, he is a master for us all."
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Quotation from Tim BernersLee 