In special relativity, a four-vector is an object with four in general complex components that transform in a specific way under Lorentz transformations. Specifically, a four-vector is an element of a 4-dimensional vector space considered as a representation space of the standard representation of the Lorentz group, the (½,½) representation. It differs from a Euclidean vector in how its magnitude is determined. The transformations that preserve this magnitude are the Lorentz transformations. They include spatial rotations, boosts (a change by a constant velocity to another inertial reference frame), and temporal and spatial inversions.