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XI - \thepage } %} \input{tcilatex} \begin{document} \section{Ma 681} \vspace{1pt} \section{Lecture 11} \vspace{1pt} Series Representations of Functions \vspace{1pt} Remark: We have seen that a power series that converges in an open disk defines an infinitely differentiable function in that disk. We now go the other way and show that a function that is differentiable in an open disk can be represented as a power series expanded about the center of that disk. \vspace{1pt} Theorem \ Taylor Series \ Let $f$ be differentiable in an open disk $D$ about $a.$ Then for each $z\in D$ \vspace{1pt} \begin{center} $f\left( z\right) =\dsum_{n=0}^{\infty }\dfrac{f^{(n)}\left( a\right) }{n!}% \left( z-a\right) ^{n}$ \vspace{1pt} \end{center} Proof: Let $z$ be any point in $D,$ and let $R$ be the radius of $D.$ Let $r$ be such that $0