Invariant

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Invariant may have several meanings, among which are:

• Invariant (computer science), an expression whose value doesn't change during program execution
• In computer science, a type in overriding that is neither covariant nor contravariant
• Invariant (mathematics), something unaltered by a transformation, for example: taking a homotopy group functor on the category of topological spaces. Then, homomeomorphic spaces have isomorphic fundamental group. See topological invariant.
• Invariant (music)
• Invariant (physics), meaning that something does not change under a transformation, such as from one reference frame to another
• Writer invariant, property of a text which is similar in all texts of a given author, and different in texts of different authors.

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