Complement

Complement may refer to:

The arts

 * Complement (music), an interval that, when added to another, spans an octave
 * Aggregate complementation, the separation of pitch-class collections into complementary sets
 * Complementary color, in the visual arts

Biology and medicine

 * Complement system (immunology), a cascade of proteins in the blood that form part of innate immunity
 * Complementary DNA, DNA reverse transcribed from a mature mRNA template
 * Complementarity (molecular biology), a property whereby double stranded nucleic acids pair with each other
 * Complementation (genetics), a test to determine if independent recessive mutant phenotypes are caused by mutations in the same gene or in different genes

Grammar and linguistics

 * Complement (linguistics), a word or phrase having a particular syntactic role
 * Subject complement, a word or phrase adding to a clause's subject after a linking verb
 * Phonetic complement
 * Complementary, a type of opposite in lexical semantics (sometimes called an antonym)

Algebra

 * Complement (group theory)
 * Complementary subspaces
 * Orthogonal complement
 * Schur complement

Algorithms

 * Complement (complexity), relating to decision problems and complexity classes
 * Complement operator (regular expressions)
 * Method of complements, in computer science
 * Radix complement
 * Diminished radix complement
 * Ones' complement
 * Two's complement

Discrete mathematics

 * Complement graph
 * Self-complementary graph, a graph which is isomorphic to its complement
 * Complemented lattice

Geometry

 * Complementary angles
 * Knot complement
 * Complement of a point, the dilation of a point in the centroid of a given triangle, with ratio &minus;1/2

Logic

 * Complement (set theory)
 * Complementary event in probability
 * Logical complement
 * Bitwise complement
 * Complements in boolean algebra

Other uses

 * Complementary experiments, in physics


 * Complement good (economics), a good often consumed together with another good
 * Ship's complement, the number of persons in a ship's company