# Is the sum of a uniformly convergent series and a non-uniformly convergent series, uniformly convergent?

Consider the series sigma (from k=1 to infinity) (-1)^k.(x+k/k^2) for x within [0,1].

I deduce that the series (-1)^k.(x/k^2) is uniformly convergent from using the M-test for convergence, and I assume that the series (-1)^k.(1/k) is not uniformly convergent because it has no x term so isn't a series of functions satisfying the definition of uniform convergence of series. (I know that it is conditionally convergent, however.)

Thus is the original series uniformly convergent?

• Dear me I totally meant uniformly convergent, sorry! Just edited it. Oct 14 '18 at 19:07

Hint. One has $$\sup_{x \in [0,1]}\left|(-1)^k\frac{x+k}{k^2} \right|=\frac1{k^2}+\frac1k\qquad (k\ge1)$$ thus the given series does not converge uniformly over $$[0,1]$$.