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Tensors: K-delta quick question

  1. Nov 12, 2015 #1
    sorry solved
     
    Last edited: Nov 12, 2015
  2. jcsd
  3. Nov 12, 2015 #2

    Geofleur

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    By ## \eta ## are you referring to the Minkowski metric? Also, I assume that only indices that appear once raised and once lowered are being summed over, so that ## \eta^{ii} ## is not to be summed, correct?
     
  4. Nov 13, 2015 #3
    thanks, the issue was simply that sometimes I forget we are dealing with components and not whole vectors, matrices etc.
     
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