- #1

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Can someone explain me the summation of this? I simply don't get it?

Thanks in advance.

- Thread starter Waxterzz
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- #1

- 82

- 0

Can someone explain me the summation of this? I simply don't get it?

Thanks in advance.

- #2

mfb

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The second equation is the first one with the argument that the sum over j' looks like "something"+"something"+...+"something" (N times the same summand) = N*"something".

- #3

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I don't get how you go from the double summation to the new one with the new index etc.

The second equation is the first one with the argument that the sum over j' looks like "something"+"something"+...+"something" (N times the same summand) = N*"something".

Oh yeah i forgot to say: in the new expression they put X

It's a function of the difference, X

Also I don't get why you start from -N/2 and end with (N-1)/2

- #4

mfb

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Make an example. Write down all summands for N=5 and see how it works out.

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