Decades: 1340s 1350s 1360s 1370s 1380s - 1390s - 1400s 1410s 1420s 1430s 1440s
Years: 1387 1388 1389 1390 1391 - 1392 - 1393 1394 1395 1396 1397
Births
Deaths
... there is a repeated 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 ...