overshadow
发表于 2025-3-25 06:21:17
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VOK
发表于 2025-3-25 09:14:33
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amnesia
发表于 2025-3-25 12:09:52
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Graduated
发表于 2025-3-25 17:36:23
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avenge
发表于 2025-3-25 21:06:51
The Lie DerivativeBefore defining the Lie derivative of tensor fields, we introduce some important concepts.
mydriatic
发表于 2025-3-26 00:11:51
Differential FormsCartan’s calculus of differential forms is particularly useful in general relativity. We begin our discussion with some algebraic preliminaries.
Pandemic
发表于 2025-3-26 07:26:55
Affine ConnectionsIn this section we introduce an important additional structure on differentiable manifolds, thus making it possible to define a “covariant derivative” which transforms tensor fields into other tensor fields.
大酒杯
发表于 2025-3-26 11:06:27
IntroductionThe discovery of the general theory of relativity (GR) has often been justly praised as one of the greatest intellectual achievements of a single human being. At the ceremonial presentation of Hubacher’s bust of Einstein in Zürich, W. Pauli said:
Ballad
发表于 2025-3-26 14:38:31
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要求比…更好
发表于 2025-3-26 17:34:45
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