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United States Chess Federation

The United States Chess Federation (USCF) is the primary chess organization within the United States. The federation runs US Chess Live[?].

External Link

www.USChess.Org (http://www.uschess.org) (official)

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Quadratic formula

... we get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> Generalizations The formula and its proof remain ...