Evaluating Riemann Integrals of f(x)=x^k where k>1 is an Integer

abm
Messages
3
Reaction score
0
Please Help... Riemann

Please Help!
To compute the Riemann integral of f:[0,1]->R given f(x)=x^k where k>1 is an integer
1. Let m>2 and define q_m= m^(-1/m) Let P_m be the partition of [0,1] given by P_m=(0< q_m^m < q_m^(m-1)< ...< q_m <1)
Explicitly evalute L(f,P_m) and U(f,P_m)
2. Show that lim n->inf. L(f,P_m)= 1/(k+1),and lim n->inf. U(f,P_m)= 1/(k+1)
3. Show that f is integrable on [0,1]
4. Show that integra[0,1] f(x) dx= 1/(k+1)
 
Physics news on Phys.org
We'll help, but you have to work with us. Show how you started and where you got stuck.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
Back
Top