- #1
linearfish
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Homework Statement
Prove:
(1) the series
[tex]\sum_{n=0}^\infty (-1)^n x^n (1-x)[/tex]
converges absolutely and uniformly on the interval [0,1]
(2) the series
[tex]\sum_{n=0}^\infty x^n (1-x)[/tex]
converges absolutely and uniformly on the interval [0,1]
The Attempt at a Solution
I have shown, by induction, that the limiting function of the second series is 1 - xn+1, which goes to 1. Thus the series of functions converges (absolutely, since all values are positive) but is 0 at x = 1, so thus not continuous. Therefore, the convergence of the second series is not uniform. However, this also shows that the first series converges absolutely.
Where I am stuck is with uniform convergence of the first series. Using partial sums I was able to show that the series converges to (1-x)/(1+x), but how do I show this is uniform? I don't think it's enough to say that the limiting function is continuous in the given interval.
Can anyone tell me if I'm on the right track or what I can use to prove uniform convergence? Thanks.