The Appell series is a type of mathematical series that generalizes the concept of power series and is related to certain types of functions known as Appell functions. The series is named after the French mathematician Paul Appell. A typical form of an Appell series can be represented as follows: \[ f(x) = \sum_{n=0}^{\infty} A_n x^n \] where \(A_n\) are the coefficients that depend on certain parameters.
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