Decades: 1260s 1270s 1280s 1290s 1300s - 1310s - 1320s 1330s 1340s 1350s 1360s
Years: 1311 1312 1313 1314 1315 - 1316 - 1317 1318 1319 1320 1321
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... equation <math>ax^2+bx+c=0</math> in terms of the coefficients a, b and c, which are assumed to be real (but see below for generalizations) with a being ...