Let be a bounded function such that for any partition P of [a,b].
Prove that there exists a constant c such that for any x in [a,b] (by contradiction) .
Appreciate if someone could help on this one. Thanks...
Okay, I understand it now. Thanks, NonCommAlg
But, I realized that you have picked an instance of a partition in this case, which is P={a,b}. But in the proof we have to show that for any partition interval. Shouldn't we have to assume for any partition P?