Question: don't know how to solve. Let X = (Xn) be a sequence in RP and let r be given by r = lim sup (I|x.|
don't know how to solve.

Let X = (Xn) be a sequence in RP and let r be given by r = lim sup (I|x.| |1/*). Then E (x.) is absolutely convergent if r 1. [The limit superior u = lim sup (b.) of a bounded sequence of real numbers was defined in Section 18. It is the unique number u with the properties that (i) if u
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