2.9 Moving Arguments And Fragile Commands
Certain types of commands, called fragile commands, can
seriously mess things up when they are used in what is termed a
moving argument. These types of
argument are generally those whose contents are copied to another part of the
document. For example, section headings appear at the start of a
section, but they can also appear in the table of contents. The
\footnote command is a fragile command, so
will cause an error[An extra `}'??].
If there is no other command to use in its place, you should
use \protect immediately before the
fragile command:
[Footnotes in LaTeX section headings]This, however, is a contrived example, because it isn't a good idea to have a footnote in a section heading, as it will also end up in the table of contents, and possibly in page headings.
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