Invariant

• Invariant (computer science), an expression whose value doesn't change during program execution • Loop invariant, a property of a program loop that is true before (and after) each iteration • A data type in method overriding that is neither covariant nor contravariant • Class invariant, an invariant used to constrain objects of a class ==Physics, mathematics, and statistics==

• Invariant (mathematics), a property of a mathematical object that is not changed by a specific operation or transformation • Rotational invariance, the property of function whose value does not change when arbitrary rotations are applied to its argument • Scale invariance, a property of objects or laws that do not change if scales of length, energy, or other variables, are multiplied by a common factor • Topological invariant • Invariant (physics), something does not change under a transformation, such as from one reference frame to another • Invariant estimator in statistics • Measurement invariance, a statistical property of measurement • Oxford University Invariant Society, an Oxford student mathematics club ==Other uses==

• Invariant chain, a polypeptide which plays a critical role in antigen presentation • 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 • Invariances, a 2001 book by philosopher Robert Nozick ==See also==