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1250s

Centuries: 12th century - 13th century - 14th century

Decades: 1200s 1210s 1220s 1230s 1240s - 1250s - 1260s 1270s 1280s 1290s 1300s

Years: 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259

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The great mathematician Fibonacci dies

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Quadratic formula

... solution x, and this solution is real. (Geometrically, this means that the parabola described by the quadratic equation touches the x-axis in a single point.) If the ...