so I get , which is great but how the S looks? How to make all idices the same?
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Originally Posted by Lisa91 so I get , which is great but how the S looks? How to make all idices the same? Indexes have no impact on the outcome of the sum so you call all of them k or r or m or f or g or whatever you want!
Well... We have . Then we get which is wrong. We should get .
Originally Posted by Lisa91 So, I got How to combine them all? I don't know how to cope with those . For instance, if I go back to n, I get n=0 in the first term, which is not what I want... Here's the mistake. The last one should have began from n = 2 (since we didn't do anything to it). So write it from n = 1 by subtracting the value at n = 1.
Thank you all so much! Now it's ok
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