In Roman mythology, Summanus was the god of nocturnal thunder, as opposed to Jupiter, the god of diurnal (daylight) thunder. There was a temple to him on the Circus Maximus. His festival was on June 20.
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... 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 should be understood as ...