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Maths question

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

http://upload.wikimedia.org/math/9/c/9/9c97ac83319da4c3e0eb7f0b2e69bd2b.png

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

Comments

(Anonymous)
Feb. 21st, 2006 06:54 am (UTC)
symbol
http://whatis.techtarget.com/definition/0,,sid9_gci803019,00.html

Old, but not dumb.