Leonhard Euler: mathematician's 306th birthday honoured by Google Doodle - Telegraph.co.uk

The prolific Euler, pronounced 'Oiler', developed many of the notations mathematicians still use today, while also making discoveries in fields from infinitesimal calculus to graph theory. He is the only mathematician to have two numbers named after him: Euler's Number in calculus, e, is approximately equal to 2.71828, and Euler's Constant γ (gamma, officially called the Euler-Mascheroni Constant), approximately equal to 0.57721, used in differential equations. The focus of most of Euler's work, however, was on infinitesimal calculus, and he successfully defined logarithms for negative and complex numbers. Euler worked in a large number of fields, including geometry, infinitesimal calculus, trigonometry, algebra and number theory. He also made long-lasting contributions to fields such as continuum physics and lunar theory. Despite suffering from failing eyesight, with the aid of assistants and his photographic memory he produced vast quantities of work. Euler published an average of one mathematical paper each week in 1775. He died in St Petersburg in 1783 of a brain haemorrhage, reportedly suffered during a conversation about the orbit of the newly discovered Uranus. via Technology - Google News http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNESAIeA7EKVF9em4ORFvhATFYoHxw&url=http://www.telegraph.co.uk/technology/google/google-doodle/9994312/Leonhard-Euler-mathematicians-306th-birthday-honoured-by-Google-Doodle.html

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