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1921

Years: 1916 1917 1918 1919 1920 - 1921 - 1922 1923 1924 1925 1926

Events

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 Quadratic formula ... $\pm \sqrt {b^2-4ac}$ in the formula should be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In som ...

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