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For example, I want to make footnotes both at Sentence 1 and Sentence 2 (which are on the same page) to the same footnote. Wikipedia's "References" have this effect.

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3  
You might also want to look at the endnotes package. It places all footnotes at the end of the document. –  Martin Scharrer Nov 16 '11 at 11:46
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Related question with the same problem in beamer (don't know if that counts as a duplicate): tex.stackexchange.com/questions/27763/… –  doncherry Nov 16 '11 at 11:56
    

6 Answers 6

up vote 41 down vote accepted

You could do this (tested in article and amsart):

Text with first footnote\footnote{\label{note1}This is the labeled footnote}
and more text with a second footnote\footnote{here}.

In this a paragraph we have a reference to the first
footnote\footnotemark[\ref{note1}].

The result will be

Footnotes as per above code example

Edit: Further testing reveals, that the above solution fails when footnotes are numbered with anything other regular numbers. This is due to the fact, that the argument to \footnotemark is the value of a counter. Placing

\makeatletter
\newcommand\footnoteref[1]{\protected@xdef\@thefnmark{\ref{#1}}\@footnotemark}
\makeatother

in the preamble will allow us to mend the above example allowing any numbering of the footnotes.

Text with first footnote\footnote{\label{note1}This is the labeled footnote}
and more text with a second footnote\footnote{here}.

In this a paragraph we have a reference to the first footnote\footnoteref{note1}.

Edit 2: This will cause a problem when using hyperref where the link created by the \footnoterefmacro points to the previous footnote and not to the referenced footnote. Using the package cleveref as in this answer seems to be the perfect fit.

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Thanks spet! But when I add \usepackage[pdftex]{hyperref} to the preamble, the red square of the last footnote is not displayed properly. Do you mind giving some hints? –  Covi Nov 16 '11 at 13:02
    
@Covi: I'm not all that familiar with the internals of hyperref but I suspect that the problem is, that the link is constructed from the value of the footnote counter and not the value associated with the label given to \footnoteref. I think we need an expert on the subject to solve this :) –  spet Nov 16 '11 at 13:17
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@Covi: DO NOT provide a driver to hyperref. It is smart enough to do this by itself, and a wrong driver will cause a lot of trouble. –  Martin Scharrer Nov 16 '11 at 13:41
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@Covi: Have a look at Multiple references to the same footnote with hyperref support - is there a better solution?. It looks like it would be helpful. –  Martin Scharrer Nov 16 '11 at 13:42
    
This second answer to @MartinScharrer's link works for me. I will edit the above answer. –  spet Nov 16 '11 at 20:44

I'm a bit surprised that noone mentioned KOMA-Script's \footref before. The KOMA-Script manual also has an example where multiple reference to the same footnote could make sense:

Maybe you have to mark each trade name with a footnote which states that it is a registered trade name.

One could think of other similar cases…

\documentclass{scrartcl}
\begin{document}

Company SplishSplash\footnote{This is a registered trade name.
All rights are reserved.\label{refnote}}
produces not only SplishPlump\footref{refnote}
but also SplishPlash\footref{refnote}.

\end{document}

This functionality can be used with the standard classes by using scrextend:

\documentclass{article}
\usepackage{scrextend}
\begin{document}

Company SplishSplash\footnote{This is a registered trade name.
All rights are reserved.\label{refnote}}
produces not only SplishPlump\footref{refnote}
but also SplishPlash\footref{refnote}.

\end{document}

And for completeness' sake: memoir has its own \footref:

\documentclass{memoir}
\begin{document}

Company SplishSplash\footnote{This is a registered trade name.
All rights are reserved.\label{refnote}}
produces not only SplishPlump\footref{refnote}
but also SplishPlash\footref{refnote}.

\end{document}
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\footref{refnote} worked perfect for me, even when inside a table! –  WarrenFaith Apr 8 '13 at 22:31

Objection, your honor:

Have you ever seen that in a book? Probably not. Because: Two footnotemarks numbered with e.g. an "8" raise the question whether it is a typo. But your readers can not come and ask you, if you really meant to do it this way.

Please, if you'd like to refer to the same text, make a footnote saying (maybe in better English than mine):

¹ Long sentence at: Wallace, Infinite Jest, p. 1234.

² See footnote 1.

What you'd like to do is against an old and sensible tradition. It neither an excuse that a part of Wikipedia does it, nor that it is technically possible.

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6  
In general I have the same opinion about this as you, but for example this is really common for affiliations: Smith, A. ^1, Miller, B. ^2, Williams, C. ^1 --- 1 Institute for Research on Footnotes, A-town. 2 Footnotes Reasearch & Developement, Inc., B-town. (especially if there is a list of 20 authors with 14 affiliations, and some of the authors have even more than one affiliation.) –  Stephen Mar 12 '12 at 17:12
    
@KeksDose: Good point. Where do I get the number for the referenced footnote? –  DerMike Nov 7 '12 at 10:58
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@DerMike In the answer above you find \labe{footn:on-something}. Just put that (not tested, though) in the footnote you'd like make a reference to. –  Keks Dose Nov 7 '12 at 11:42

The Wikibook LaTeX provides an answer to this question:

To make multiple references to the same footnote, you can use the following syntax:

Text that has a footnote\footnote{This is the footnote} looks like this.
Later text referring to same footnote\footnotemark[\value{footnote}] uses
the other command.

If you need hyperref support, use instead:

Text that has a footnote\footnote{This is the footnote}
\addtocounter{footnote}{-1}\addtocounter{Hfootnote}{-1} looks like this.
Later text referring to same footnote\footnotemark uses the other command.

Note that these approaches don't work if there are other footnotes between the first reference and any of the other "duplicates".

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Digging this up to add a note on affiliations:

While I originally ended up on this page to do exactly what the OP intended, I agree with Keks Dose - referring to a footnote as in your example seems the more sensible option (and it's something I have frequently seen footnotes that say "See above" in books etc.)

Stephen, any decent LaTeX template should provide means of adding affiliations without having to resort to "normal" footnotes. In the LNCS template I'm using quite frequently for papers, this is achieved using the \inst command (for institute):

\author{First Author\inst{1} \and Second Author\inst{1} \and Another Author\inst{2}}

\institute{
Some university
\and
Some company
}

I don't know if there are any packages that do this, but I would think so ...

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I found a rather simple way to do this. Just place a label inside the first footnote, and where you want your second reference you make insert a cross reference to that label in superscript, to make it look like a footnote

    line1 \footnote{text bla bla \label{xx}}
    line2 \textsuperscript{\ref{xx}}
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This seems to be a slight variation of this answer. –  lockstep Jun 4 '13 at 12:54
    
This becomes a problem when there's a page break between the two lines. –  rmp251 May 13 at 15:19

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