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Problem with notation ?

  1. Apr 26, 2013 #1


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    Reading this paper


    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


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


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    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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