http://i291.photobucket.com/albums/l...Capture834.jpg

We have to prove that the indicator function is riemann integrable on [a, b]. However, there is no value given for a and b. And I don't understand the if the hint is for solving the integral or if it is for proving that it is riemann integrable.

The only notes given to solve this problem are as follows --

http://i291.photobucket.com/albums/l...Capture987.jpg