# Invariant Redirected from **Invariant (disambiguation)**

**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
- 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