Invariant
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Invariant".

Look up invariant in Wiktionary, the free dictionary.

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.
• Invariant Point (physics), A unique condition of temperature, pressure and concentration in a system, which allows a number of phases to coexist in equilibrium.
• Invariant representation (cognitive science), the form or essence of something, an abstraction from particulars
• The Invariant Society, the undergraduate mathematical society of Oxford University

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