[Tex/LaTex] amsthm: what are the newtheoremstyle parameters for the default styles

amsthmtheorems

The package amsthm contains the predefined theorem styles plain, definition and remark which you can employ using \theoremstyle before your \newtheorem.

You can also create new theorem styles like this:
\newtheoremstyle{NAME}{ABOVESPACE}{BELOWSPACE}{BODYFONT}{INDENT}{HEADFONT}{HEADPUNCT}{HEADSPACE}{CUSTOM-HEAD-SPEC}. I.e. you have to set all properties of your new style at once.

But I mostly like them as they are, I only want to change like 1 parameter. Therefore I'd like to know the \newtheoremstyle parameters which produce the predefined styles, so I can copy them and only change what I want. I would expect that information to be in the documentation of the package, but it isn't. Does anyone know what they are?

Best Answer

The style "plain" should be equivalent to

\newtheoremstyle{plain}
  {\topsep}   % ABOVESPACE
  {\topsep}   % BELOWSPACE
  {\itshape}  % BODYFONT
  {0pt}       % INDENT (empty value is the same as 0pt)
  {\bfseries} % HEADFONT
  {.}         % HEADPUNCT
  {5pt plus 1pt minus 1pt} % HEADSPACE
  {}          % CUSTOM-HEAD-SPEC

The style "definition" is the same except for the body font, which is \normalfont; in "remark" the spaces above and below are 0.5\topsep, the head font is \itshape and the body font is \normalfont.

Related Solutions

[Tex/LaTex] amsthm: \newtheoremstyle, headspace, \mbox{}, and lists

If using ntheorem instead of amsthm is an option (see Theorem packages: which to use, which conflict?), then you can use the predefined style break:

\documentclass{article}
\usepackage{ntheorem}

\newtheorem{theorem-plain}{Theorem}[section] 
\theoremstyle{break}
\newtheorem{theorem-break}{Theorem}[section] 

\begin{document}

  \section{Plain Theorems}

  \begin{theorem-plain}[foo]
    Lorem ipsum sit amet dolor.
  \end{theorem-plain}

  \begin{theorem-plain}[foo]
    \begin{itemize}
      \item foo
      \item bar
    \end{itemize}
    Lorem ipsum sit amet dolor.
  \end{theorem-plain}

  \section{Theorems with Linebreaks after header}

  \begin{theorem-break}[foo]
    Lorem ipsum sit amet dolor. 
  \end{theorem-break}

  \begin{theorem-break}[foo]
    \begin{itemize}
      \item foo
      \item bar
    \end{itemize}  
    Lorem ipsum sit amet dolor.
  \end{theorem-break}

\end{document}

enter image description here

[Tex/LaTex] Theorem starting with a list

in your first example, you can insert \samepage just before the \begin{enumerate}; this will keep the previous line on the same page as the list, and the penalties set by \samepage will go away at the \end{theorem}.

an alternate approach suggested for ams authors is to manually set the first line of the enumerated list as the first line of the theorem, and start the list itself with the second item. \samepage can be used in the same way as above if the first item is short.

here is your first example, modified as described. the theorem head and the first item will move to the second page.

\documentclass{article}
\usepackage{lipsum}
\usepackage{amsthm}

\theoremstyle{plain} 
\newtheorem{theorem}{Theorem}[section] 

\title{Theorem lists test}
\begin{document}
\maketitle
\section{test}

\lipsum[1-3]

\vspace{1cm}

\begin{theorem}
\hangindent\leftmargini
1.\hskip\labelsep First item.
\samepage
\begin{enumerate}
\setcounter{enumi}{1}
%\item first
\item second.
\end{enumerate}
\end{theorem}

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] amsthm: \newtheoremstyle, headspace, \mbox{}, and lists

[Tex/LaTex] Theorem starting with a list

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