We present a simple formula which is helpful in understanding the result of combining two Lorentz transformations, in particular two rotations or two Lorentz boosts. In the latter case the Wigner little group rotation occurs naturally. The formulas for the resultant angle of rotation and rapidity are generalizations of trigonometric addition theorems and of the relativistic law for adding collinear velocities.
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© 1986 American Association of Physics Teachers.
1986
American Association of Physics Teachers
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