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From: Teemu Pennanen <pennanen@hkkk.fi>
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Subject: beep
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Hello,

Is this a bug in emacs: every now and then when I'm editing a LaTeX file
with emacs and try to make a superscript in math-mode with "^", I get a
beep istead of the character. This problem seems to come out of the blue,
and nothing seems to help. When it happens, I have to restart emacs, and 
sometimes even that doesn't work. Could it be that I'm causing it somehow 
myself? 

I'm running emacs in RedHat Linux 6.2. 

Best,
Teemu Pennanen
Helsinki School of Economics