Analytical continuation is a technique in complex analysis that allows for the extension of the domain of a given analytic function beyond its original radius of convergence. This method is crucial in understanding various mathematical constructs, especially when dealing with special functions, and plays a significant role in establishing relationships among them, such as those found in functional equations. It is particularly important for examining properties of functions like the Riemann zeta function, exploring their zeros, and connecting to number-theoretic results.
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