Complement (mathematics)

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Complement has a variety of uses in mathematics:

• complement, an operation that transforms an integer into its additive inverse, useful for subtracting numbers when only addition is possible, or is easier
• complement, a system for working with signed numbers in computer science
  • Ones' complement
  • Two's complement

• Complement graph
• Complement (group theory)
• Complement (set theory)
• Complement operator (regular expressions)

• Complementary angles
• Complementary event
• Complementary subspaces

• Complements in Boolean algebra
• Knot complement
• Orthogonal complement
• Method of complements
• Relatively complemented lattice
• Schur complement
• Complement of a point, the dilation of a point in the centroid of a given triangle, with ratio -1/2

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