Complement

Not to be confused with compliment, an expression of praise.

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
  • Object complement, a word or phrase adding to the direct object of a verb phrase.
• Complementary distribution
• Phonetic complement
• Complementary, a type of opposite in lexical semantics (sometimes called an antonym)

Mathematics

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

• Complement of an angle, the difference between a right angle (90 degrees) and a given angle
• Knot complement
• Complement of a point, the dilation of a point in the centroid of a given triangle, with ratio −1/2

Logic

• Complement (set theory)
• Negation, also known as "logical complement"
• Bitwise complement

Other uses

• Complement good (economics), a good often consumed together with another good
• Ship's complement, the crew

See also

• Complementarity (disambiguation)
• Compliment (disambiguation)
• Complimentary (disambiguation)