i'd like to put this in the "Problem of the week" section but TPH might get angry at me.. anyhow, i want to see the proof of this..

Let

let h(x) =

(why cant i remove the right brace?)

where x is always nonnegative and m,n are natural numbers relatively prime..

show that this function is Riemann integrable on any interval

(This function is called Thomae's Function)..