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About: Stewart–Walker lemma     Goto   Sponge   NotDistinct   Permalink

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Type: yago:WikicatLemmasyago:WikicatTensorsyago:Abstraction100002137yago:Cognition100023271yago:Communication100033020yago:Concept105835747yago:Content105809192yago:Idea105833840yago:Lemma106751833yago:Message106598915yago:Proposition106750804yago:PsychologicalFeature100023100yago:Quantity105855125yago:Statement106722453yago:Tensor105864481yago:Variable105857459 New Facet based on Instances of this Class

The Stewart–Walker lemma provides necessary and sufficient conditions for the linear perturbation of a tensor field to be gauge-invariant. if and only if one of the following holds 1. 2. is a constant scalar field 3. is a linear combination of products of delta functions