LyX ⇒ How to write theorem heading in bold font

[ALIX]

Hi everybody,
I want to write (Remark) as bold font, like: Theorem, Lemma, Definition, etc.
Please can any one tell me how?

Thanks

[justdeath]

I installed LyX, looks weird to me.

But anyway, open your document, go to the place where you want to input the remark, then press Insert TeX code (Ctrl+L).

Paste this before the usage of the custom remark:

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\newtheoremstyle{remboldstyle}
  {}{}{}{}{\bfseries}{.}{.5em}{{\thmname{#1 }}{\thmnumber{#2}}{\thmnote{ (#3)}}}
\theoremstyle{remboldstyle}
\newtheorem{rembold}{Remark}[section]

The number of the remark will depend on sections.

Now you again Insert TeX code where you want to write the remark, just this code:

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\begin{rembold}

Write the body of the remark, and close it by:

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\end{rembold}

And view the document.



Technical stuff below.

Well, the command is not obvious:

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\documentclass{article}
\usepackage{amsthm}

\newtheoremstyle{remboldstyle}
  {}{}{\itshape}{}{\bfseries}{.}{.5em}{{\thmname{#1 }}{\thmnumber{#2}}{\thmnote{ (#3)}}}
\theoremstyle{remboldstyle}
\newtheorem{rembold}{Remark}[section]

\begin{document}
\section{Section}

\begin{rembold}[Cauchy]
The text of the remark.
\end{rembold}

\end{document}

If you want normal text, remove \itshape, just make it {}. Same applies for \bfseries.

Nikolay

[ALIX]

Thank u so much Nikolay,
but there is a problem, for example, when I write Theorem 1.1.1, and then Lemma 1.1.2, and I want to write the Remark by using this code, becomes Remark 1.1.1
So, is there any way to become Remark 1.1.3 for example?

[Stefan Kottwitz]

Hi Alix!

as, thanks to the very good explanation of Nikolay, the original problem has been solved, it would be good to open a new topic for the new problem. You can imagine, that nobody would expect a theorem numbering issue in a "Bold Font" topic. Readers, who could help, might overlook your new question. So a new topic with a new and expressive topic subject would be the best.

Anyway, I saw your question and try to help. You could share counters for the theorem environment. This means using another \newtheorem syntax for theorem environments which are based on other such environments:

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\newtheorem{<environment name>}[<numbered like environment>]{<caption>}

For example, if your first theorem environment is called theorem, you may define

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\newtheorem{lemma}[theorem]{lemma}
\newtheorem{rembold}[theorem]{Remark}

and now lemmas and remarks are numbered following the theorem counter.

Stefan

[ALIX]

Yes, you're right thank you .