Crossword Genius

Precursor to precalculus (7)

Ross

I believe the answer is:

algebra

(Other definitions for algebra that I've seen before include "system employing symbols" , "Part of the maths syllabus" , "'Branch of mathematics, uses letters and symbols (7)'" , "Calculation by symbols" , "Branch of generalised arithmetic" .)

I've seen this clue in The New York Times.
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