| 摘 要： | 3. Dynamics In the space-time (M, g), it is convenient to introduce an orthonormal basis {E_a}={n, e_μ} which is invariant under the group of isometries. The components of h_(αβ)=e_α·e_β=δ_(αβ) and the metric components are g_(ab)=diag(-1, 1, 1, 1). (3.1) The vectors {e_α} generate a group of transformations in each surface {t=constant}. This is the group reciprocal to the group of isometries. They belong to the same Bianehi type and have the same parameters. The commutators of {e_μ, e_v} 1] are
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