Alfred, Duke of Saxe-Coburg-Gotha[?], (1844-1900), later Duke of Edinburgh and Duke of Saxe-Coburg and Gotha, second son of [[Victoria of the United Ki
... it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of those element(s) of the field whose square equals b2 ...