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has gloss | eng: The Stewart–Walker lemma provides necessary and sufficient conditions for the linear perturbation of a tensor field to be gauge-invariant. \Delta \delta T = 0 if and only if one of the following holds |
lexicalization | eng: Stewart Walker lemma |
lexicalization | eng: Stewart-Walker lemma |
lexicalization | eng: Stewart–Walker lemma |
instance of | c/Lemmas |
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