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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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Sec. 2] Functional Series 309<br />

Determ<strong>in</strong>e the circle of convergence:<br />

2564. V W. 2566. V 0, let us require that --- < e; whence w+l<br />

(i a) N t \R n (x)\ is <strong>in</strong>deed less than e for all x of the sub<strong>in</strong>terval<br />

(- 1+a, 1 aj and the uniform convergence of the given series on any sub<strong>in</strong>terval<br />

with<strong>in</strong> the <strong>in</strong>terval ( 1, 1) is thus proved.<br />

As for the entire <strong>in</strong>terval ( 1, 1), it conta<strong>in</strong>s po<strong>in</strong>ts that are arbitrarily<br />

J/I+ 1<br />

close to Jt=i, and s<strong>in</strong>ce Hm R = n (x) \im .-- =00, no mattei how large n is,<br />

X-+1 X-+1 1 X<br />

;><br />

ea

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