*4. If 2:;;:1 akxk has radius of convergence Rand ak =J 0 for large k, prove that...

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*4. If 2:;;:1 akxk has radius of convergence Rand ak =J 0 for large k, prove that lim inf 1 ~ 1 ::; R ::; lim sup 1 ~ I· k-->oo ak+ 1 k-->oo ak+ 1

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