The history of Lorentz transformations comprises the development of linear transformations forming the Lorentz group or Poincaré group preserving the Lorentz interval − x 0 2 + ⋯ + x n 2 {\displaystyle -x_{0}^{2}+\cdots +x_{n}^{2}} and the Minkowski inner product − x 0 y 0 + ⋯ + x n y n {\displaystyle -x_{0}y_{0}+\cdots +x_{n}y_{n}}. Wikipedia