well
an example would be this:
n
sigma (k)= 1+2+4+5+6.....+n (sum from 1 to n *must be integer*)
k=1
(if k=0, it would be from 0 to n...)
my 4th power would be:
n
simga (k^4)=1^4 + 2^4 + 3^4 + 4^4 +5^4 .........+n^4
k=1
(i did these works secertly in class *math class is too boring*, it took me a lot of work to find out forumla of 1^4+2^4.....n^4)
(haha, finally, there are somethings that tormad doesnt know....; ) )
