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What does Delta mean in this case

  1. Mar 8, 2008 #1
    1. The problem statement, all variables and given/known data

    R = { (X,Y) [tex]\epsilon[/tex] P(A) x P(A) / (X[tex]\Delta[/tex]Y) [tex]\subseteq[/tex] B}

    (X[tex]\Delta[/tex]Y) [tex]\subseteq[/tex] B - what does delta mean?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 8, 2008 #2


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    Staff Emeritus
    Science Advisor

    Probably "symmetric difference": A union B \ A intersect B: that is, all points that are in A or B but [/b]not[/b] in both.
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