algebra
/ˈæl.d͡ʒɪ.bɹə/ noun B2- Elementary algebra: A system for representing and manipulating unknown quantities (variables) in equations.
- Abstract algebra: A broad field of study in modern mathematics (often mentioned alongside analysis) loosely characterized by its concern for abstraction and symmetry, dealing with the behavior, classification, and application of a large class of objects (called algebraic structures) and the maps between them (called, most generally, morphisms).
- A universal algebra.
- An algebraic structure consisting of a module over a commutative ring (or a vector space over a field) along with an additional binary operation that is bilinear over module (or vector) addition and scalar multiplication.
- A collection of subsets of a given set, such that this collection contains the empty set, and the collection is closed under unions and complements (and thereby also under intersections and differences).
- A system or process (especially one that is complex or convoluted) that substitutes one thing for another, or uses signs or symbols to represent concepts or ideas.
Plural algebras
From the library
Phillips was back in the corner explaining a problem in algebra to Prissy Andrews and the rest of the scholars were doing pretty much as they pleased eating green apples, whispering, drawing pictures on their slates, and driving crickets harnessed to strings, up and down aisle.
By the end of the term Anne and Gilbert were both promoted into the fifth class and allowed to begin studying the elements of “the branches”--by which Latin, geometry, French, and algebra were meant.
Mine is geometry of course, and Jane’s is Latin, and Ruby and Charlie’s is algebra, and Josie’s is arithmetic.
Moody Spurgeon still thinks he failed in history and Charlie says he failed in algebra.
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