Why is it that R_{n}-L_{n}= (f(b)-f(a)) on [a,b]? I've tried manipulating summations but I can't seem to figure it out.

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- August 25th 2012, 07:37 PMfeifanDifference of right and left Riemann sum
Why is it that R

_{n}-L_{n}= (f(b)-f(a)) on [a,b]? I've tried manipulating summations but I can't seem to figure it out. - August 26th 2012, 12:36 AMVlasevRe: Difference of right and left Riemann sum
The simplest way is to say that except for the first summand of (it is ) and the last summand of (it is ), all the other terms appear in both sums. When you subtract, you are left with .