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Product of two Minkowksi metrics

  1. Dec 2, 2013 #1
    Can I say that [itex]\eta^{ij}\eta_{km}=\delta^{i}_{k}\delta^{j}_{m}[/itex]?

    Kind of in the same way that they yield one delta in the case where one of their indices is summed over?

  2. jcsd
  3. Dec 2, 2013 #2


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    but [itex]\eta^{ij}\eta_{km}[/itex] is sometimes minus-one :confused:
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