Alphabetical list of historical battles (see also Military history, List of battles):
NOTE: Where a year has been used to disambiguate battles it is the year when the battle started. In some cases these may still have gone on for several years.
... formula reads
<math>
x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}
</math>
The term b2 – 4ac is called the discriminant of the quadratic equation, because ...