[OS X TeX] \ifthenelse in \author ?

[Josep M.Font]

Hi all,

Sorry if this is not a specifically MacOS X-oriented question.

IL am trying to use the \ifthenelse command (from the ifthen package) 
in amsart document class. I am writing something like 
\ifthenelse{\equal{A}{B}}{then clause}{else clause}, where A,B will be 
text strings. It works well if used inside the document's body, but I 
would like to use it inside the \author{} command (and use \maketitle 
afterwards) and in this case LaTeX complains that \equal is not 
defined.

I know \maketitle does some special things, but I am not an expert. Any 
idea ? Should I abandon my plan ?

Thanks in advance,

JMaF

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