Invariant

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Rhombicuboctahedron by Leonardo da Vinci

Invariant and invariance may have several meanings, among which are:

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

Invariant (mathematics), something unaltered by a transformation, for example: taking a homotopy group functor on the category of topological spaces. Then, homeomorphic spaces have isomorphic fundamental group.
- 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 (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

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