Approximation Theory
An analytic function is a complex function that is locally represented by a convergent power series around each point in its domain. This means that at any point where the function is defined, it can be expressed as a power series, which gives it nice properties such as differentiability and continuity. Analytic functions are crucial in various areas of mathematics, particularly in understanding how functions behave near specific points and in approximating other functions through techniques like Padé approximants.
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