Ostrowski Hadamard Gap Theorem
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, the Ostrowski Hadamard gap theorem is a result about the analytic continuation of complex power series whose non-zero terms are of orders that have a suitable "gap" between them. Such a power series is "badly behaved" in the sense that it cannot be extended to be an analytic function anywhere on the boundary of its disc of convergence. The result is named after the mathematicians Alexander Ostrowski and Jacques Hadamard. Let 0 1 and all j N, frac{p_{j ...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, the Ostrowski Hadamard gap theorem is a result about the analytic continuation of complex power series whose non-zero terms are of orders that have a suitable "gap" between them. Such a power series is "badly behaved" in the sense that it cannot be extended to be an analytic function anywhere on the boundary of its disc of convergence. The result is named after the mathematicians Alexander Ostrowski and Jacques Hadamard. Let 0 1 and all j N, frac{p_{j + 1}}{p_{j}} lambda. Let ( j)j N be a sequence of complex numbers such that the power series f(z) = sum_{j in mathbf{N}} alpha_{j} z^{p_{j}} has radius of convergence 1. Then no point z with z = 1 is a regular point for f, i.e. f cannot be analytically extended from the open unit disc D to any larger open set including even a single point of the boundary of D.
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