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Maths question

I can't remember what the squiggly thing is in this equation:


I realise it is a math doohicky which stands for some complicated equation wozit, but I forget what that is. Help?


Feb. 21st, 2006 04:43 am (UTC)
Unfortunately, this ain't no simple integration. It has to do with the Forster radius, and 'J' (above) is only a small part of the nasty equation. Sigh.