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basis, four- vectors basis, orthonormal tetrad center of momentum frame Compton scattering formula Doppler shift Doppler shift, transverse Einstein summation convention energy, conservation of energy, for photons energy, rest- mass energy energy, total four- acceleration four- force four- momentum four- momentum, conservation of four- vector four- vector, magnitude four- vector, null four- vector, scalar product four- vector, spacelike four- vector, timelike four- velocity, definition of four- velocity, for photons index index, dummy index, free kinetic energy, of a particle Planck's constant transformation, inverse transformation, matrix transformation, of basis vectors , transformation, of vector components