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(latex.info)\footnote

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\footnote
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   `\footnote[number]{text}'

   The `\footnote' command places the numbered footnote `text' at the
bottom of the current page.  The optional argument, `number', is used
to change the default footnote number.  This command can only be used
in outer paragraph mode; i.e., you cannot use it in sectioning commands
like `\chapter', in figures, tables or in a `tabular' environment.