Algebra
Algebra was a branch of mathematics concerning the study of structure, relation, and quantity. Together with geometry, analysis, combinatorics, and number theory, algebra was 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. ()

In 2373, The Doctor's holographic daughter Belle was studying algebra and trigonometry which was ahead of her age; at one point, she asked her father to do some algebra problems with her. ()

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Mathematics