[Tex/LaTex] How to make an observation numbering in bold

boldcross-referencingformatting

I'm writing a paper in LIPIcs template.

\newtheorem{observation}[theorem]{\textbf{Observation}}

\newcommand{\robs}[1]{Observation~\ref{#1}}
\newcommand{\rfig}[1]{Fig.~\ref{#1}} 
\newcommand{\rlem}[1]{Lemma~\ref{#1}}
\newcommand{\rdef}[1]{Definition~\ref{#1}}
\newcommand{\rthm}[1]{Theorem~\ref{#1}}
\newcommand{\rpro}[1]{Proposition~\ref{#1}}
\newcommand{\rcor}[1]{Corollary~\ref{#1}} 
\newcommand{\rse}[1]{Section~\ref{#1}}

However the observation number is not in bold.
I want to make the observation number bold.

How can I do this?

Best Answer

You can use the definition style (available though amsthm internally loaded by the class) for your observation theorem-like structure:

\documentclass[a4paper,UKenglish]{lipics}

\theoremstyle{definition}
\newtheorem{observation}[theorem]{Observation}

\begin{document}

\begin{observation}
test
\end{observation}

\end{document}

enter image description here

Related Solutions

[Tex/LaTex] Exam Class: Make math expressions in \correctchoice bold

The best solution would be to use \correctchoice as a hook and tack \boldmath and \unboldmath onto it that way using a formula of \edef and \expandafters that I've yet to grasp/memorize. See How to add a hook to a macro.

In absence of hooking, I would say

\renewcommand{\choiceshook}{%
  \ifprintanswers
    \let\oldchoice\choice
    \let\oldcorrectchoice\correctchoice
    \def\choice{\unboldmath\oldchoice}
    \def\correctchoice{\oldcorrectchoice\boldmath}
  \fi}

\noprintanswers:
enter image description here

\printanswers:
enter image description here

[Tex/LaTex] Theoremstyle; leaving vertical space between the theorem header and the body of the theorem

One option using amsthm and a new defined style (I also used \swapnumbers since your example suggests that you want numbers to appear before the name):

\documentclass{article}
\usepackage{amsthm}

\swapnumbers

\newtheoremstyle{newline}
  {\topsep}%Space above
  {\topsep}%Space below
  {\itshape}%Body font
  {}%Indent amount
  {\bfseries}% Theorem head font
  {}%Punctuation after theorem head
  {\newline}%Space after theorem head
  {}% Theorem head specification
\theoremstyle{newline}
\newtheorem{theo}{Theorem}

\begin{document}

\begin{theo}    
A test theorem.
\end{theo}

\end{document}

The result:

enter image description here

The ntheorem package offers you the out of the box style changebreak:

\documentclass{article}
\usepackage{ntheorem}

\theoremstyle{changebreak}
\newtheorem{theo}{Theorem}

\begin{document}

\begin{theo}    
A test theorem.
\end{theo}

\end{document}

The examples above will produce the head, a line break and then the body of the structure; if a complete blank line separating the head and the body is required, then you can modify my examples. For the first case, using amsthm, one could say something like

\documentclass{article}
\usepackage{amsthm}

\swapnumbers

\newtheoremstyle{newline}
  {\topsep}%Space above
  {\topsep}%Space below
  {\itshape}%Body font
  {}%Indent amount
  {\bfseries}% Theorem head font
  {\vspace{\baselineskip}}%Punctuation after theorem head
  {\newline}%Space after theorem head
  {}% Theorem head specification
\theoremstyle{newline}
\newtheorem{theo}{Theorem}

\begin{document}

\begin{theo}    
A test theorem.
\end{theo}

\end{document}

which will now produce

enter image description here

but I find this extra spacing to be odd and wouldn't recommend this style. Something similar (defining a new style) can be done using ntheorem.

Best Answer

Related Solutions

[Tex/LaTex] Exam Class: Make math expressions in \correctchoice bold

[Tex/LaTex] Theoremstyle; leaving vertical space between the theorem header and the body of the theorem

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