[texhax] Weird behavior of \mathop

Michael Barr barr at math.mcgill.ca
Wed Nov 10 15:13:39 CET 2010

Thanks to Donald Arsenau for actually explaining this.  But on the basis 
of what he said, I would expect
  \def\E{\mathop{\bf {E}}}
to work.  However,
  \def\E{\mathop{\bf E\kern0pt}}
works perfectly.

If you actually want this (somewhere I read a rather unconvincing 
explanation why Knuth did), then \setbox0=\hbox{$\E$} ought to get around 
the bug.


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