I hope can someone clarify this for me.(adsbygoogle = window.adsbygoogle || []).push({});

I have a sequence f(of n) which is like this:

fn(x) = [tex] 0-- if--x<\frac{1}{n+1}[/tex]

is = [tex] sin^2(x/pi)--if--\frac{1}{n+1}<=x<=\frac{ 1}{n}[/tex]

is = [tex]0--if--\frac{1}{n}<x[/tex]

(the - are for spaces because I don't know how to do it. Nothing is negative)

Then there is a summation (sigma) of f(of n). I don't understand how can there be such a summation for sequence by parts or how it would look like. Can anyone explain please?

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# Summation of a sequence by parts.

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