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I What is the purpose of this symbol?

  1. May 30, 2016 #1
    What exactly is the name and operation of the symbol that is found right after the approximately equal sign in the attachment? I have come across it a lot in readings, and I feel like I should clear up what it is.

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  2. jcsd
  3. May 30, 2016 #2


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    The imaginary part?
  4. May 30, 2016 #3


    Staff: Mentor

    What book were you studying? That may give us a clue.
  5. May 30, 2016 #4
    The symbol in question is German upper case letter J

    On "the approximately equal sign"... watch Carl Bender @ 50:10 - 51:10
  6. May 31, 2016 #5


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    Dexitify gives ##\Im##. German J looks like ##\mathfrak{J}##.
    Agree with micromass. The imaginary part makes sense contextually as well (approximating the derivative along the imaginary axis).
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