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Find a, b, c

Posted: Sat May 17, 2008 10:53 am
by o.m.
Let f be a real function defined on [0;1] which is \( C^3 \) (it means that f''' there exists and it is continous).

Find a, b, c such that

\( \frac{1}{n}\sum_{k=1}^{n}f(k/n)=a+\frac{b}{n}+\frac{c}{n^2}+\frac{u(n)}{n^2} \)

with u(n) tend to zero when n tend \( \infty \).

Posted: Mon May 19, 2008 6:38 pm
by aleph
This is just a special case of the Euler-Maclaurin summation formula.