Invariant
An invariant or invariance is a term that denotes something unchanged. The exact meaning of a term depends on the area where it is used: ▪ An invariant is a physical quantity whose value does not change with the passage of time in some physical process. ▪ An invariant is a logical expression whose value remains unchanged, for example, after the cycle of a body. ▪ Invariant - a term in linguistics to denote a phoneme in its implementation. ▪ The invariant is a scalar quantity that characterizes the inertia of the body in terms of the theory of relativity. ▪ Invariant is a vector space subspace.