Johan Jensen was a Danish mathematician known for his work in mathematical analysis, particularly in the field of convergence and the theory of series. He was born on March 30, 1874, and passed away on June 29, 1959. One of his significant contributions is Jensen's inequality, which is a fundamental result in convex analysis. The inequality characterizes the relationship between the value of a convex function at the average of points and the average of the function values at those points.
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