Math & Science ⇒ Customized theorems with ntheorem and tikZ

[elfangor]

Hello,


I'm trying to adjust ntheorem such that I get my theorems as in the attachment.

Screenshot-3.png (8.2 KiB) Viewed 5032 times

I haven't succeeded at this because \theoremframecommand only take one argument and not two. (In my code, Theorem 1 is below the statement of the theorem)

Here is my preamble

Code: Select all

\usepackage[utf8x]{inputenc}
\usepackage[dutch]{babel}

\usepackage{graphicx,textpos, a4wide}
\usepackage[svgnames]{xcolor}
\usepackage{helvet, amssymb}

\usepackage{tikz}
\usetikzlibrary{shadows}
\usetikzlibrary{shapes}
\usetikzlibrary{decorations}



\usepackage{framed}
\usepackage[framed, amsthm]{ntheorem}


\theoremclass{Theorem}
\theoremstyle{empty}
 \newcommand{\thmbox}[1]{
  \tikzstyle{thmbox} = [rectangle, rounded corners, draw=black, fill=Gray!20, inner sep=15pt, drop shadow={fill=black, opacity=.5}]%
  \tikzstyle{fancytitle} =[fill=white, text=black, rectangle, rounded corners, draw= black]%
  \noindent%
  \begin{tikzpicture}%
    \node [thmbox] (box){%
      \begin{minipage}{.91\textwidth}%
        \textit{#1}%
      \end{minipage}%
    };%
  \node[fancytitle, right=10pt] at (box.north west) {\textbf{Theorem 1}%
    };%
    \end{tikzpicture}}
 
\def\theoremframecommand{\thmbox}
\newshadedtheorem{theorem}{Theorem}

Are there ways to put the Theorem \arabic{theorem} nicely where it belongs? (I also want to put the name of the theorem in that box, so just by replacing "Theorem 1" by "Theorem \arabic {theorem}" will not do the trick.


And also, why do I need to use a newshadedtheorem statement for my framedtheorem instead of newframedtheorem. It doesn't seem right...

Greetz,
Elfangor

[ignasi]

next code worked for me. I just replaced \textbf{Theorem 1} with \textbf{Theorem \thetheorem}.

Hope it helps.

Ignasi

Code: Select all

\documentclass{article}

%\usepackage[utf8x]{inputenc}
%\usepackage[dutch]{babel}

\usepackage{graphicx,textpos, a4wide}
\usepackage[svgnames]{xcolor}
\usepackage{helvet, amssymb}

\usepackage{tikz}
\usetikzlibrary{shadows}
\usetikzlibrary{shapes}
\usetikzlibrary{decorations}

\usepackage{framed}
\usepackage[framed, amsthm]{ntheorem}

\theoremclass{Theorem}
\theoremstyle{empty}
\newcommand{\thmbox}[1]{
  \tikzstyle{thmbox} = [rectangle, rounded corners, draw=black, fill=Gray!20, inner sep=15pt, drop shadow={fill=black, opacity=.5}]%
  \tikzstyle{fancytitle} =[fill=white, text=black, rectangle, rounded corners, draw= black]%
  \noindent%
  \begin{tikzpicture}%
    \node [thmbox] (box){%
      \begin{minipage}{.91\textwidth}%
        \textit{#1}%
      \end{minipage}%
    };%
  \node[fancytitle, right=10pt] at (box.north west) {\textbf{Theorem \thetheorem}%
    };%
    \end{tikzpicture}}

\def\theoremframecommand{\thmbox}
\newshadedtheorem{theorem}{Theorem}

\begin{document}
\begin{theorem}
Hello
\end{theorem}

\begin{theorem}
Hello
\end{theorem}
\end{document}

[elfangor]

This indeed an improvement, but my goal was to put the abc I added in the body, in the first theorem, to be next to Theorem \thetheorem. So, this is already quite nice, but perhaps it could get even nicer

Elfangor

next code worked for me. I just replaced \textbf{Theorem 1} with \textbf{Theorem \thetheorem}.

Hope it helps.

Ignasi

Code: Select all

\documentclass{article}

%\usepackage[utf8x]{inputenc}
%\usepackage[dutch]{babel}

\usepackage{graphicx,textpos, a4wide}
\usepackage[svgnames]{xcolor}
\usepackage{helvet, amssymb}

\usepackage{tikz}
\usetikzlibrary{shadows}
\usetikzlibrary{shapes}
\usetikzlibrary{decorations}

\usepackage{framed}
\usepackage[framed, amsthm]{ntheorem}

\theoremclass{Theorem}
\theoremstyle{empty}
\newcommand{\thmbox}[1]{
  \tikzstyle{thmbox} = [rectangle, rounded corners, draw=black, fill=Gray!20, inner sep=15pt, drop shadow={fill=black, opacity=.5}]%
  \tikzstyle{fancytitle} =[fill=white, text=black, rectangle, rounded corners, draw= black]%
  \noindent%
  \begin{tikzpicture}%
    \node [thmbox] (box){%
      \begin{minipage}{.91\textwidth}%
        \textit{#1}%
      \end{minipage}%
    };%
  \node[fancytitle, right=10pt] at (box.north west) {\textbf{Theorem \thetheorem}%
    };%
    \end{tikzpicture}}

\def\theoremframecommand{\thmbox}
\newshadedtheorem{theorem}{Theorem}

\begin{document}
\begin{theorem}[abc]
Hello
\end{theorem}

\begin{theorem}
Hello
\end{theorem}
\end{document}

[Amatheux]

Hello Everyboby,

I have tried yours codes and it is very nice. Thanks a lot.
I have an other question, how can I do if I want to have the same thing instead
for Proposition, Corollary,... etc..... instead of Theorem.

Thanks..
Jean