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From: "Stefan Monnier <foo@acm.com>" <monnier+gnu.emacs.help/news/@flint.cs.yale.edu>
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Subject: Re: Can't bind "\C-=" and "\C-+" keys
Date: 10 Oct 2002 10:06:36 -0400
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>>>>> "d2002xx" == d2002xx  <d2002xx@myrealbox.com> writes:
> When I bind the two keys by (global-set-key "\C-=" 'undo) and
> (global-set-key "\C-+" 'redo), Emacs says "Invalid modifiers in
> string".

C-= and C-+ are not characters, so you can't put them into a string.
Thus you need to use something like

        (global-set-key [(control ?+)] 'redo)


-- Stefan