Invariant

Invariant and invariance may refer to:

Computer science

• Invariant (computer science), an expression whose value doesn't change during program execution
  • Loop invariant, invariants used to prove properties of loops
• A data type in method overriding that is neither covariant nor contravariant
• Class invariant, invariants used to constrain objects of a class

Mathematics

• Invariant (mathematics), something unaltered by a transformation
  • Topological invariant
• Invariant (physics), meaning that something does not change under a transformation, such as from one reference frame to another
• The Invariant Society, the Oxford student mathematics society
• Invariant estimator in statistics
• Measurement invariance, a statistical property of measurement

Other uses

• Invariant (linguistics), a word that does not undergo inflection
• Invariant (music)
• Writer invariant, property of a text which is similar in all texts of a given author, and different in texts of different authors
• Invariance (magazine), a French Communist journal