In Latvian mythology, Austras Koks ("tree of the east" or "tree of the dawn") was a tree that grew from the start of Saules' (the sun's) daily journey across the sky. It is usually considered an oak.
... a field of characteristic 2, the element 2a is zero and it is impossible to divide by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula ...