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Lyon Playfair

Baron Lyon Playfair (1818 - 1898) was the first Baron Playfair of St. Andrews. He was an English scientist and Parliamentarian.

The Playfair cipher is named for him.

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Quadratic formula

... 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 squar ...

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