Reduction, reduced, or reduce may refer to: Science and technology Chemistry Reduction (chemistry), part of a reduction-oxidation (redox) reaction in which atoms have their oxidation state changed. Organic redox reaction, a redox reaction that takes place with organic compounds Ore reduction: see smelting Computing and algorithms Reduction (complexity), a transformation of one problem into another problem Reduction (recursion theory), given sets A and B of natural numbers, is it possible to effectively convert a method for deciding membership in B into a method for deciding membership in A? Bit Rate Reduction, an audio compression method Data reduction, simplifying data in order to facilitate analysis Graph reduction, an efficient version of non-strict evaluation L-reduction, a transformation of optimization problems which keeps the approximability features Partial order reduction, a technique for reducing the size of the state-space to be searched by a model checking algorithm Strength reduction, a compiler optimization where a function of some systematically changing variable is calculated more efficiently by using previous values of the function Variance reduction, a procedure used to increase the precision of the estimates that can be obtained for a given number of iterations Reduce (computer algebra system), a general-purpose computer algebra system geared towards applications in physics Reduce (higher-order function), in functional programming, a family of higher-order functions that process a data structure in some order and build up a return value Reduced instruction set computing, a CPU design philosophy favoring an instruction set reduced in size and complexity of addressing, to simplify implementation, instruction level parallelism, and compiling Pure mathematics and statistics Reducible as the opposite of irreducible (mathematics) Reduction (mathematics), the rewriting of an expression into a simpler form Beta reduction, the rewriting of an expression from lambda calculus into a simpler form Dimension reduction, the process of reducing the number of random variables under consideration Lattice reduction, given an integer lattice basis as input, to find a basis with short, nearly orthogonal vectors Subject reduction or preservation, a rewrite of an expression that does not change its type Reduction of order, a technique for solving second-order ordinary differential equations Reduction of the structure group, for a -bundle and a map an -bundle such that the pushout is isomorphic to Reduction system, reduction strategy, the application of rewriting systems to eliminate reducible expressions Reduced form, in statistics, an equation which relates the endogenous variable X to all the available exogenous variables, both