|  | | | Karl Weierstrass | Karl Weierstrass, pictured at the right, is often referred to as the father of modern analysis. Contrary to the pattern of most mathematicians, most of his mathematics was done after he reached his 40s. In the late 1800s he,Georg Cantor and Richard Dedekind were at the forefront of the mathematical movement that "arithmetized" analysis. His "epsilons and deltas", long the bane of calculus students, gave mathematicians the methods and tools to prove results in calculus that they had been unable to prove for 200 years.
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