What is the purpose of this symbol?

  • #1
367
13
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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    Screen Shot 2016-05-30 at 2.07.53 PM.png
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Answers and Replies

  • #3
13,580
7,568
What book were you studying? That may give us a clue.
 
  • #4
993
48
The symbol in question is German upper case letter J

On "the approximately equal sign"... watch Carl Bender @ 50:10 - 51:10
 
  • #5
pwsnafu
Science Advisor
1,080
85
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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