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Problem with notation ?

  1. Apr 26, 2013 #1

    Mentz114

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    Gold Member

    Reading this paper

    http://lanl.arxiv.org/abs/gr-qc/9611042v1

    I'm baffled by this bit on page 3,
    In a footnote on page 4 we are told
    By this, K·K = 0 and equation 2.1 is nonsense. What have I missed ?
     
  2. jcsd
  3. Apr 26, 2013 #2

    martinbn

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    Science Advisor

    The dot notation from the footnote has parentheses as well, and it is just dot, not a cdot.
     
  4. Apr 26, 2013 #3

    Mentz114

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    Gold Member

    Yes, thank you. What I missed was that K is not in boldface.

    So r = K·K [itex]\equiv[/itex] KμKμ ( μ = 0,1,2,3)
     
    Last edited: Apr 26, 2013
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