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enter image description hereThe theorem of the picture is written in bold, I mean: Theorem 1.2 (Pythagorean theorem). I want to write a definition with that format. Also, it would be better if it's written with small capitals. Beforehand, thank you.

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Have a look at the amsthm package. It lets you do things like

\documentclass{article}

\usepackage{amsthm}

\newtheorem{defn}{Definition}

\begin{document}

    \begin{defn}[\scshape Definition]
        A definition is a definition.
    \end{defn}

\end{document}

If you want to change the appearance, you can either use one of the three predefined theorem styles in amsthm, or use \newtheoremstyle to create your own one like so:

\documentclass{article}

\usepackage{amsthm}
\usepackage[T1]{fontenc}

\newtheoremstyle{mijail}
    {3pt}
    {3pt}
    {\itshape}
    {}
    {\bfseries}
    {}
    {.5em}
    {\thmname{#1} \thmnumber{#2} \thmnote{(\scshape #3)}}

\theoremstyle{mijail}
\newtheorem{defn}{Definition}

\begin{document}

    \begin{defn}[Definition]
        A definition is a definition.
    \end{defn}

\end{document}

Note that your standard font might not include bold small caps, hence the use of \usepackage[T1]{fontenc}.

  • Thank you, it is exactly what I wanted – Mijail Littin May 27 '19 at 17:25

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