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What does the \ symbol mean, please?

  1. Mar 25, 2009 #1
    ... as in [tex]\bold{R}^2[/tex]\[tex]\{\bold{0}\}[/tex]

    Used in context here http://books.google.com/books?id=4Y...hsjnCQ&sa=X&oi=book_result&resnum=1&ct=result top of the page.

    I've previously seen the notation [tex]\bold{R}^2-\{\bold{0}\}[/tex] for the cartesian plane with the origin excluded, so I hesitated to assume that the above notation meant the same thing.
  2. jcsd
  3. Mar 25, 2009 #2
    It means the same thing as R - {0} Actually "X - Y" as is an old notation back when the term "set arithmetic" was still used. So the modern notation is X\Y.
  4. Mar 25, 2009 #3


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    Ditto. The LaTeX for that operator is \setminus.
  5. Mar 26, 2009 #4
    Thanks and thanks.
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