Algebra is a branch of mathematics concerning the study of structure, relation, and quantity. Together with geometry, analysis, combinatorics, and number theory, algebra is one of the main branches of mathematics.
In 2370, when Jake Sisko announced to his father that he had good news, Benjamin originally guessed that Jake had passed an algebra test. (DS9: "The Homecoming")
In a deleted scene from DS9: "The Nagus", Miles O'Brien wanted to see the algebra homework of Jake Sisko and Luta.