LaTeX技巧562：如何定制漂亮精美的定理环境

之前的博文中，曾经定制了一个较为简单的定理漂亮的盒子，LaTeX技巧327，下面摘自一个博客的定制相对好看一些，希望对大家的排版有所帮助。

Here is a little sty file for LaTeX that is inspired from this. The result :

With this file, you can create new environments with \newboxedtheorem. It works kind of like \newtheorem except that you have to give it a counter name as a third argument. To be more precise :

\newboxedtheorem[options]{theo}{Theorem}{thCounter}

If you don't put anything in the last {}, your environment won't be numbered. If you want to make another environment numbered like this one, just put the same counter name, for example :

\newboxedtheorem{defi}{Definition}{thCounter}

There are a lot of options. For example, thcounter=section will have your environment's counter go back to 0 whenever you enter a new section in your document.

Here is the full list of the options with their default value :

titlecolor = black, titlebackground = white, background = white,
titleboxcolor = black, boxcolor = black, thcounter=, size = .9\textwidth

Finally, the code used for the example :

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{boiboites}

\newboxedtheorem[boxcolor=orange, background=blue!5, titlebackground=blue!20,
titleboxcolor = black]{theo}{Theorem}{anything}

\begin{document}
  \begin{theo}[Law of Large Numbers]
     Let $(X_n)_{n\in \mathbb{N}}$ be an infinite sequence of i.i.d. variables with finite expected value. Then:
     $$\frac{1}{n} \sum_{i=1}^n X_i \overset{\textnormal{a.s.}}{\longrightarrow}
         \mathbb{E} (X_1) .$$
  \end{theo}
\end{document}

选自：http://snouffy.free.fr/blog-en/index.php/post/2010/01/30/Nice-boxes-for-your-theorems-with-tikz