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1268

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

Decades: 1210s 1220s 1230s 1240s 1250s - 1260s - 1270s 1280s 1290s 1300s 1310s

Years: 1263 1264 1265 1266 1267 - 1268 - 1269 1270 1271 1272 1273

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Quadratic formula

... the discriminant of the quadratic equation, because it discriminates between three qualitatively different cases: If the discriminant is zero, then there is a repeated ...