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|Library of Congress||QA150-272.5|
Algebra (from the Arabic الجبر ("al-djebr" meaning "reunion", "connection" or "completion")) is a branch of mathematics which may be defined as a generalization and extension of and is focused on finding patterns between groups of numbers, operators, and other mathematical objects. The following category includes articles about algebra. Algebra is also a branch of mathematics that substitutes letters for numbers, replacing the unknown value with a letter.