Decades: 1340s 1350s 1360s 1370s 1380s - 1390s - 1400s 1410s 1420s 1430s 1440s
1393 1394 1395 1396 1397 - 1398 - 1399 1400 1401 1402 1403
Births
Deaths
... positive, then there are two different solutions x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.) If the ...