Question 9.T.15: Let R be the radius of convergence of the power series ∑anx^...

Let R be the radius of convergence of the power series \sum{a_{n}x^{n}}. If 0 < r < R, then the series converges uniformly on [−r, r].

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For any x ∈ [−r, r],

\left|a_{n}x^{n}\right| ≤ |a_{n}| r^{n},  n ∈ \mathbb{N}_{0}.

Since r ∈ (−R, R), the (numerical) series \sum{\left|a_{n}\right|r^{n}} is convergent. By the M-test, with M_{n} = |a_{n}|r^{n}, the series \sum{a_{n}x^{n}} is uniformly convergent on [−r, r].

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