Mat wrote:How do I rewrite this Y*Y part in terms of delta functions? It would be nice if that whole part was just delta_ab but I can't just write that down.
3.14159265... wrote:What about quantization? we DO live in a integer world?
crp wrote:oh, i thought you meant the entire funtion was f(n) = (-1)^n
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Cosmologicon wrote:Okay, sorry, I was completely misreading. You're right, you don't need the form of Y_ab. You're also right that you can't just replace Y*Y with delta functions. You need to have the integral around it too. So replace the 1/r_12 in your integral there with the summation you're given, and see if you can manipulate it so that you have the integral over Y*Y.
Hint: summation and integration commute.
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