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Real-valued functions of real variable, analytic properties of functions and sequences, limits, continuity, smoothness of these.

17 votes
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Seeking a Geometric Proof of a Generalized Alternating Series' Convergence

Here is what I think you are looking for: First, note that if you take steps of fixed length $\ell$, and keep rotating by an angle of $\theta\neq 0$, then you will stay inside a circle of radius $r=\ …
Kevin Ventullo's user avatar