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What symbol?

  1. Aug 21, 2010 #1
    My lecturer used a symbol in class that represents an element being removed from a set to form a new set. Does anyone know what this symbol is?
     
  2. jcsd
  3. Aug 21, 2010 #2

    HallsofIvy

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    There is no standard symbol for that specific operation but your instructor is free to define one. What symbol did he use?
     
  4. Aug 21, 2010 #3
    Well that was the issue, I dont remember what the symbol was, I thought it was a standard.
     
  5. Aug 21, 2010 #4

    CRGreathouse

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    [tex]\setminus[/tex] or \ is probably the most common; - is sometimes used instead.
     
  6. Aug 22, 2010 #5

    HallsofIvy

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    The "\" crossing out a figure meaning it has been removed- erased if you like.

    Often, you will see something like "^" directly over a symbol to mean it has been removed.
     
  7. Aug 22, 2010 #6

    CRGreathouse

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    Oh. I meant like [itex]\{1,2,3,4,5\}\setminus\{2,3\}=\{1,4,5\}[/itex].
     
  8. Aug 22, 2010 #7
    If that's not it, perhaps you could draw the symbol here and see if any matches come up.

    Or draw the symbol and show us.
     
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