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Homework Help: What does this notation mean?

  1. Jul 1, 2012 #1
    1. The problem statement, all variables and given/known data
    Could anybody please explain this notation? The only thing I undersand here is the limit. Is r a superscript? If not, what is it? And what does E(variable|condition/equation) mean?

    I know that in the set theory, | means a separator between the variable and condition (ex: S = {x | f(x) = 5}, but what does it mean in this case?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jul 1, 2012 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    It's dealing with conditional probability; in this case, looking for the conditional expectation of X.
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