[texhax] math symbols in makeindex

[Zbigniew Nitecki]

Using the MakeIndex package to create an index, I wanted to have an  
entry, as if it were an ordinary R, but printed as a blackboard bold  
R.  The following indexing entry in the text
     \index{R@$\mathbb{R}$}
(following the rules on p. 652 of the Latex Companion, 2nd ed.) was  
rejected.  Here is the
entry from the ilg file:
     !! Input index error (file = Calculus.idx, line = 32):
    -- Extra `@' at position 5 of first argument.
The line referred to in the idx file is
     \indexentry{R@$\@mathbb {R}$}{17}

So the program itself seems to add an extra @, which creates an  
error.  How do I avoid the
problem?

Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

telephones:
Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966

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