Decades: 1340s 1350s 1360s 1370s 1380s - 1390s - 1400s 1410s 1420s 1430s 1440s
Years: 1389 1390 1391 1392 1393 - 1394 - 1395 1396 1397 1398 1399
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... 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 square equals b2 - ...