Decades: 1150s 1160s 1170s 1180s 1190s - 1200s - 1210s 1220s 1230s 1240s 1250s
1200 1201 1202 1203 1204 - 1205 - 1206 1207 1208 1209 1210
Births
Deaths
... coefficients a, b and c are complex numbers, or more generally members of any field whose characteristic is not 2. (In a field of characteristic 2, the element 2a is zero ...