for anyone working on this article, here is a useful news item [1] (http://www.myafghan.com/news2.asp?id=-1451334158) Kingturtle 18:51 Apr 29, 2003 (UTC)
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... by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of those element(s) of the field whose square equals b2 ...