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Homework Help: What does this notation mean?

  1. Dec 30, 2008 #1
    Say if I have a solid vertical line on the right of partial differential equation, with a subscript to that line, i.e:

    d |

    Hard to write out so I hope you can tell what it is. What does the line mean?
  2. jcsd
  3. Dec 30, 2008 #2


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    Homework Helper

    It generally indicates the variable held constant during the partial differentiation.
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