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I'm talking specifically about probability theory. I was reading some stuff about probabilistic graphical models, and they kept switching the notation in this book, but I couldn't discern the difference by context.

One possible hypothesis is that they are subtly different, e.g., $P$ is a probability measure, while $\Pr$ is an unnormalized probability measure (or something; I really have no idea).

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    If there's a difference, your book should mention it. Did you look at the beginning of the book?2012-05-11
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    Well, the notational difference is that one has an $r$ and the other doesn't ...2012-05-11
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    I would guess sloppy writing, or at best, poor choice of symbols.2012-05-11
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    @Graphth, sure did! They didn't mention the difference.2012-05-11
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    Which book is that?2012-05-13
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    Are you still interested in the answer to this question?2012-05-15
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    I am; to answer @Didier's question, it was a probability book I got from my university's math library. I returned it, but I tend to check a lot of them out at once until I understand what I'm doing, so I've forgotten which one precisely. I apologize for not replying.2012-05-17
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    When we have a huge equation having variables named p ..... Then writing Pr(.) instead of P(.) would make it more visible, I think. And it cuts off the blunder of treating P as a variable2015-02-24

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