General ⇒ how to write numbered examples in lecture notes

[nguyenvinhphu]

Hello everybody,

I am writing a lecture note where I insert some examples to explain somethings.
I would like the examples to be appeared differently from the rest (distinguished from the rest). So, I have been
looking for an environment that can do this. Say, text in example should be smaller
or put in a box or having a vertical line on the right.

Could you please help me which environment should be used?

Many thanks in advance.

Vinh Phu

[localghost]

Have a look at packages like amsthm or ntheorem. If these do not provide suitable environments, describe your ideas more precise. Perhaps we then could create an environment that fits your needs.


Best regards and welcome to the board
Thorsten¹

[nguyenvinhphu]

Hi localghost,

It seemed that the ntheorem package is what I am looking for but when I used

\usepackage[framed,amsmath,thmmarks]{ntheorem}
\usepackage{framed}

I got the following error

Package ntheorem Error: Theorem style plain already defined.

How to remove it please.

Thanks.

[nguyenvinhphu]

Sorry for stupid questions, I figured out how to do. That's it.

\usepackage{amsmath,amssymb,amsfonts,stmaryrd}
\usepackage[framed,amsmath,thmmarks]{ntheorem}

(can not put amsmath in both)

Then, the following define a Example environment with a vertical line along the left side:

\theoremstyle{example}
\theorembodyfont{\small}
\definecolor{gray}{rgb}{0.6,0.6,0.6}
\renewcommand*\FrameCommand{{\color{gray}\vrule width 5pt \hspace{10pt}}}
\newframedtheorem{exam}{Example}[section]

Thanks a lot.

P