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Notation question: like a direct product

  1. Jun 28, 2009 #1
    I am coming across a notation in a math text whose form and context suggest it is something like a direct product. The symbol is a multiplication X with a vertical line connecting the two left side ends. Can someone identify this symbol please?

    The context can be seen here http://books.google.com/books?id=3J...CQrZcB&sa=X&oi=book_result&ct=result&resnum=1 2/3rds the way down on the page. This is an online preview of the text I am reading.
     
  2. jcsd
  3. Jun 28, 2009 #2

    Hurkyl

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  4. Jun 29, 2009 #3
    Hurkyl to the rescue again. That is it.

    And look. The article lists the LaTex commands. [tex]
    G = R^4 \ltimes SL(2,C)
    [/tex]
     
    Last edited: Jun 29, 2009
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