Authors in War
Many of the authors that served in various real-life wars (and survived) wrote stories that are at least somewhat based on their own experiences. Some of them are outright memoirs or fictionalized accounts of their exploits.
... 2a is zero and it is impossible to divide by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of ...