Pelota is a name for a variety of court games played with a ball using one's hand, a racket or a bat. They derive from real tennis (see Jeu de Paume) and are widely played in the Basque provinces.
... \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements ...