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|1.||<math>\phi(t_2, t_1)\phi(t_1, t_0) = \phi(t_2, t_0)</math>
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|2.||<math>\phi^{-1}(t, \tau) = \phi(\tau, t)</math>This HURTZ
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|3.||<math>\phi^{-1}(t, \tau)\phi(t, \tau) = I</math>
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