 While the "position"-4-vectors of the events change between different inertial frames, their spacetime distance remains invariant under the corresponding Lorentz transformation.Other examples of Lorentz scalars are the "length" of 4-velocities (see below), or the Ricci curvature in a point in spacetime from General relativity, which is a contraction of the Riemann curvature tensor there.In special relativity the location of a particle in 4-dimensional spacetime is given by 

where formula_2 is the position in 3-dimensional space of the particle, formula_3 is the velocity in 3-dimensional space and formula_4 is the speed of light.