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Footnotes can be produced in one of two ways. They can be produced with
one command, the \footnote command. They can also be produced with
two commands, the \footnotemark and the \footnotetext commands. See
the specific command for information on why you would use one over the
other.
\footnote[number]{text}
\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.
\footnotemark{number}
\footnotemark command puts the footnote number in the text.
This command can be used in inner paragraph mode. The text of the
footnote is supplied by the \footnotetext command.
This command can be used to produce several consecutive footnote markers referring to the same footnote by using
\footnotemark[\value{footnote}]
after the first \footnote command.
\footnotetext[number]{text}
\footnotetext command produces the text to be placed at the
bottom of the page. This command can come anywhere after the
\footnotemark command. The \footnotetext command must appear in
outer paragraph mode.
The optional argument, number, is used to change the default footnote number.