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I guess

$ A \stackrel{\mathcal L}{=} B $

means $A$ and $B$ hand side has the same probability distribution. Is that right?

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The next time you ask about notation, please don't forget to mention the book/paper/whatever you were reading when you saw this. – J. M. Sep 15 '11 at 1:03
It's an unpublished book. But I will remember your suggestion. – ablmf Sep 15 '11 at 1:51
up vote 6 down vote accepted

Correct. $A$ and $B$ are "equal in law" (thus the letter L), that is $A$ and $B$ have the same distribution.

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