[texhax] \Pr and displaylimits

[Aditya Mahajan]

Hi,

I have a question about the rationale of defining \Pr with 
displaylimits.

In plain.tex \Pr is defined without \nolimits as

\def\Pr{\mathop{\rm Pr}}

Other macro packages (LaTeX and ConTeXt) provide hooks for changing 
operator fonts, but basically copy this definition without the 
nolimits. In the books that I have seen, limits on Pr have the visual 
effect of

\Pr\nolimits^{g}(X \mid Y)

So why did Knuth choose not to have a \nolimit with \Pr. 
Are there branches of mathematics where limits with Pr should be 
displaylimits?

Aditya