A system for computation using letters or other symbols to represent numbers, with rules for manipulating these symbols.
A system or process, that is like algebra by substituting one thing for another, or in using signs, symbols, etc., to represent concepts or ideas.
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 universal algebra.
One of several other types of mathematical structure.
The study of algebraic structures.
The surgical treatment of a dislocated or fractured bone. Also (countable): a dislocation or fracture.
Any formal system in which symbolic expressions are manipulated according to fixed rules.
Differential calculus and integral calculus considered as a single subject; analysis.
Deposits of calcium phosphate salts on teeth.
A stony concretion that forms in a bodily organ.
A decision-making method, especially one appropriate for a specialised realm.