# theorems and definitions boxes (numbering should be chapter-wise)

I want to write both the theorems and definitions (numbering should be chapter-wise, like 2.1, 2.2 etc) in the form of the attached jpg file.

EDIT:

In the upper box only the title will come and within the box, the theorem/definition number will come. What to do?

\documentclass{article}
\usepackage{amsmath}
\usepackage{cleveref}
\usepackage[most]{tcolorbox}
\newtcbtheorem{Theorem}{Theorem}{
enhanced,
sharp corners,
attach boxed title to top left={
yshifttext=-1mm
},
colback=white,
colframe=blue!75!black,
fonttitle=\bfseries,
boxed title style={
sharp corners,
size=small,
colback=blue!75!black,
colframe=blue!75!black,
}
}{thm}
\newtcbtheorem[no counter]{Proof}{Proof}{
enhanced,
sharp corners,
attach boxed title to top left={
yshifttext=-1mm
},
colback=white,
colframe=blue!25,
fonttitle=\bfseries,
coltitle=black,
boxed title style={
sharp corners,
size=small,
colback=blue!25,
colframe=blue!25,
}
}{prf}

\begin{document}
\begin{Theorem}{}{fermat}
No three positive integers $$a$$, $$b$$ and $$c$$ satisfy the equation $$a^{n} + b^{n} = c^{n}$$ for any integer greater than two.
\end{Theorem}
\begin{Proof}{Theorem \ref{thm:fermat}}{}
The proof is easy, but too large to fit in this box.
\end{Proof}
\end{document}


Edit 2: Only the problem is in setting counter. Theorem should come 1.1, 1.2 ... and definition should come same as 1.1, 1.2 ....

\documentclass{book}
\usepackage{amsmath}
\usepackage[most]{tcolorbox}
\usepackage{cleveref}

\tcbset{theostyle/.style={
enhanced,
sharp corners,
attach boxed title to top left={
xshift=-1mm,
yshift=-4mm,
yshifttext=-1mm
},
top=1.5ex,
colback=white,
colframe=blue!75!black,
fonttitle=\bfseries,
boxed title style={
sharp corners,
size=small,
colback=blue!75!black,
colframe=blue!75!black,
}
}}

\newtcbtheorem[number within=chapter]{Theorem}{Theorem}{%
theostyle
}{thm}

\newtcbtheorem[number within=chapter]{Definition}{Definition}{%
theostyle
}{def}
\textbf{Theorem \thetcbcounter.} }{\end{Theorem}}
\textbf{Definition \thetcbcounter.} }{\end{Theorem}}
\begin{document}

\chapter{Foo chapter}

\end{myDefinition}

\begin{myTheorem}{fffff}{fermat}
No three positive integers $$a$$, $$b$$ and $$c$$ satisfy the equation $$a^{n} + b^{n} = c^{n}$$ for any integer greater than two.
\end{myTheorem}
\end{document}

• Numbering within chapters when using article class? ;-) – user31729 May 12 '17 at 15:24

\documentclass{book}
\usepackage{amsmath}
\usepackage{cleveref}
\usepackage[most]{tcolorbox}

\newtcbtheorem[number within=chapter]{Theorem}{}{
enhanced,
sharp corners,
attach boxed title to top left={
xshift=-1mm,
yshift=-5mm,
yshifttext=-1mm
},
top=1.5em,
colback=white,
colframe=blue!75!black,
fonttitle=\bfseries,
boxed title style={
sharp corners,
size=small,
colback=blue!75!black,
colframe=blue!75!black,
}
}{thm}

\newtcbtheorem[number within=chapter]{Definition}{}{
enhanced,
sharp corners,
attach boxed title to top left={
xshift=-1mm,
yshift=-5mm,
yshifttext=-1mm
},
top=1.5em,
colback=white,
colframe=blue!75!black,
fonttitle=\bfseries,
boxed title style={
sharp corners,
size=small,
colback=blue!75!black,
colframe=blue!75!black,
}
}{def}

\textbf{Theorem \thetcbcounter.} }{\end{Theorem}}

\textbf{Definition \thetcbcounter.} }{\end{Definition}}

\begin{document}
\chapter{Foo}
\begin{myTheorem}{Fermats Last Theorem}{thm:FermatsLastTheorem}
No three positive integers $$a$$, $$b$$ and $$c$$ satisfy the equation $$a^{n} + b^{n} = c^{n}$$ for any integer greater than two.
\end{myTheorem}
\end{myDefinition}
\begin{myDefinition}{Definition}{def:Definition}
A statement of the meaning of a word, phrase, or term, as in a dictionary entry.
\end{myDefinition}
\begin{myTheorem}{Pythagoras Theorem}{thm:PythagorasTheorem}
In a right angled triangle: the square of the hypotenuse is equal to the sum of the squares of the other two sides.
\end{myTheorem}
\end{document}


• This is what exactly I want. Only problem is that the Definition which would come 1.1, 1.2 ... be included. Please modify the code to get this in addition. – user1942348 May 15 '17 at 3:50
• I have edited my post above and my modified code has a problem is setting counter in Th and Def – user1942348 May 15 '17 at 6:12
• @user1942348 I included the Definition environment. – Georg May 15 '17 at 14:07

Use the number within=chapter 'init' option of the \newtcbtheorem macro to apply chapter-wise counting of theorems defined with this macro. (See sections 5 and 16 of the tcolorbox manual for more information on the init option.)

The box style can be changed by using the xshift and yshift keys of attach boxed title to top left.

\documentclass{book}
\usepackage{amsmath}
\usepackage[most]{tcolorbox}
\usepackage{cleveref}

\tcbset{theostyle/.style={
enhanced,
sharp corners,
attach boxed title to top left={
xshift=-1mm,
yshift=-4mm,
yshifttext=-1mm
},
top=1.5ex,
colback=white,
colframe=blue!75!black,
fonttitle=\bfseries,
boxed title style={
sharp corners,
size=small,
colback=blue!75!black,
colframe=blue!75!black,
}
}}

\newtcbtheorem[number within=chapter]{Theorem}{Theorem}{%
theostyle
}{thm}

\newtcbtheorem[number within=chapter]{Definition}{Definition}{%
theostyle
}{def}

\begin{document}

\chapter{Foo chapter}

No three positive integers $$a$$, $$b$$ and $$c$$ satisfy the equation $$a^{n} + b^{n} = c^{n}$$ for any integer greater than two.

• @user1942348: Well, if you don't need the proof, omit it. The definition box can be done in the same way. – user31729 May 12 '17 at 15:35
• @user1942348: Now it is there. The shellesc.sty is just a matter of installation -- there's nothing I can do for that. – user31729 May 12 '17 at 15:47