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What is this symbol

  1. Nov 9, 2013 #1
    I have checked it is not Greek, looks like Q , am I right?

    Thanks in advance

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  2. jcsd
  3. Nov 9, 2013 #2


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    Yes, it's a calligraphic Q, ##\mathcal{Q}##.
  4. Nov 10, 2013 #3
    Thank you sir
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