In the study of mythology, a lunar deity is a god or goddess associated with or symbolizing the Moon. She is usually female, perhaps because of the association between women's menstrual cycles and the moon. She was also often associated with virginity, hunting, warriors (particularly female) and wisdom. She was usually sister, mother, daughter and/or enemy of the solar deity.
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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 - ...