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<p>This MWE might do the trick, the problem is of course that normal \footnote cannot escape \item[...] thus we need to use \footnotemark and \footnotetext<br>
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<p>\documentclass[a4paper]{article}<br>
\usepackage{ntheorem}<br>
\makeatletter<br>
\newtheoremstyle{plainfoot}%<br>
{\item[\hskip\labelsep \theorem@headerfont ##1\ ##2\theorem@separator\footnotemark]}%<br>
{\item[\hskip\labelsep \theorem@headerfont ##1\ ##2\ (##3)\theorem@separator\footnotemark]}<br>
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\makeatother<br>
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\theoremstyle{plainfoot}<br>
\theoremseparator{.}<br>
\newtheorem{theorem-foot}{Theorem}<br>
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\begin{document}<br>
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\begin{theorem-foot}<br>
\footnotetext{Test}<br>
sadf<br>
\end{theorem-foot}<br>
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\end{document}<br>
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<div style="font-family:Tahoma; font-size:13px"><br>
/Lars Madsen<br>
Institut for Matematik / Department of Mathematics<br>
Aarhus Universitet / Aarhus University<br>
Mere info: <a id="NoLP" href="http://au.dk/daleif@imf" tabindex="0">http://au.dk/daleif@math</a> / More information:
<a id="NoLP" target="_blank" href="http://au.dk/en/daleif@imf" tabindex="0">http://au.dk/en/daleif@math</a><br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> texhax <texhax-bounces@tug.org> on behalf of Victor Ivrii <vivrii@gmail.com><br>
<b>Sent:</b> 30 November 2015 17:55<br>
<b>To:</b> texhax@tug.org<br>
<b>Subject:</b> [texhax] Theorem with footnote in the header</font>
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<div dir="ltr">I am using ntheorem and I would like to have a special kind of theorem (say theorem-foot} to have an output like this where ^ means raised box
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<div>Theorem 2.1 ^5. </div>
<div>Blah-blah </div>
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<div>_____</div>
<div>^5 Cf. Theorem 1.3.</div>
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<div>Also, if Blah-blah is</div>
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<div>\begin{enumerate}</div>
<div>\item foo</div>
<div>\item bar</div>
<div>\end{enumerate}</div>
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<div>I want "foo" start at the same line as Theorem.</div>
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<div dir="ltr">Unfortunately my experiments with ntheorem did not produce what I wanted.</div>
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<div dir="ltr">Thank you in advance<br>
Victor Ivrii</div>
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