John Edensor Littlewood (1885–1977) was an influential English mathematician known for his contributions to various areas of mathematics, particularly in analysis, number theory, and mathematical logic. He is well-remembered for his collaboration with G.H. Hardy, with whom he co-authored several important works, including the famous "Hardy-Littlewood Method," which involves techniques in analytic number theory.
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John Edensor Littlewood was a mathematician whose work with Godfrey Harold Hardy connected analysis, inequalities, series and the Riemann zeta function. Their collaboration helped develop the Hardy-Littlewood circle method for arithmetic counting problems. He also worked with Mary Cartwright on nonlinear ordinary differential equations motivated by radio engineering, including the Van der Pol equation.[ref]
https://mathshistory.st-andrews.ac.uk/Biographies/Littlewood/. Biography, Hardy collaboration and Cartwright collaboration
Their investigations of strongly driven oscillators helped reveal how a deterministic dynamical system can have complicated long-term behavior. This makes his work a bridge between the estimates of classical analysis and the geometric study of dynamical systems.
Portrait of John Edensor Littlewood
. Photograph identified on the named portrait page.