Decades: 1340s 1350s 1360s 1370s 1380s - 1390s - 1400s 1410s 1420s 1430s 1440s
Years: 1389 1390 1391 1392 1393 - 1394 - 1395 1396 1397 1398 1399
Births
Deaths
... as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements have no square roots and some have two; only zero ha ...