[Tex/LaTex] tcolorbox theorem numbering

newtheoremnumberingtcolorboxtheorems

\documentclass{article}
\usepackage{amsmath,amsthm,amssymb,parskip}
\usepackage{graphicx,float,hyperref}
\usepackage[margin=1in]{geometry}
\usepackage{titling,multicol}
\usepackage{tcolorbox}
\tcbuselibrary{theorems}
\newtcbtheorem{mytheo*}{}%
{colback=purple!5,colframe=blue!100!,fonttitle=\bfseries}{th}

\begin{document}

\begin{mytheo*}{title...}{}
text...
\end{mytheo*}

\end{document}

I am trying to make the theorem unnumbered, but I have not managed to figure out how to remove the number 1 and the colon that appear at the beginning of the theorem title. Does anyone know how to do this?

Best Answer

There is a misunderstanding by the OP what \newtcbtheorem does actually:

\newtcbtheorem{foo}{...}{...}{...} will actually define both the numbered theorem - like enviroment foo and foo*, so \newtcbtheorem{foo*} will actually define foo* and foo**, leaving foo* being numbered however and foo** is the unnumbered version.

See page 340 of current tcolorbox manual for a description of this.

In addition, hyperref should be loaded as last package as almost always in 98% of all cases.

As a reply to the comment below by Bryan-M-H:

The unstarred version of the theorem has an additional mandatory argument that is meant for the label, see the changed example where the label is given as {foo}, which is extended to th:foo since the definition of the theorem has th as label prefix.

Related (but not duplicate) Counter for tcolorbox

Also related (no duplicate too): Problem with tcolorbox package

\documentclass{article}
\usepackage{amsmath,amsthm,amssymb,parskip}
\usepackage[margin=1in]{geometry}
\usepackage{titling,multicol}
\usepackage[most]{tcolorbox}

\usepackage{graphicx,float}
\usepackage{hyperref}

\newtcbtheorem{mytheo}{My theorem}{colback=purple!5,colframe=blue!100!,fonttitle=\bfseries}{th}

\begin{document}

\begin{mytheo*}{}
  text...
\end{mytheo*}

See \ref{th:foo} 

\begin{mytheo}{Foo}{foo}
  text...
\end{mytheo}

\end{document}

Related Solutions

[Tex/LaTex] Theorem without numbering

Using the amsthm package, you can switch numbering on and off for individual theorems just by defining environments with nearly identical names (as with equation environments):

\documentclass{article}
\usepackage{amsthm}
\theoremstyle{plain}

\newtheorem*{theorem*}{Theorem}
\newtheorem{theorem}{Theorem}

\begin{document}
\begin{theorem}  A numbered theorem.    \end{theorem}
\begin{theorem*} An unnumbered theorem. \end{theorem*}
\end{document}

[Tex/LaTex] Custom theorem numbering

An easy way is

\documentclass{article}
%\usepackage{amsthm} %% uncomment to see the difference
\newtheorem{innercustomthm}{Theorem}
\newenvironment{customthm}[1]
  {\renewcommand\theinnercustomthm{#1}\innercustomthm}
  {\endinnercustomthm}

\begin{document}

\begin{customthm}{8}\label{eight}
Every theorem must be numbered by hand.
\end{customthm}

Here is a reference to theorem~\ref{eight}.
\end{document}

You can also use the optional argument for attribution:

\begin{customthm}{99}[Somebody]\label{ninetynine}
Statement.
\end{customthm}

A more generic interface for defining several of these environments; this doesn't respect theorem styles; it could be adapted, though.

\documentclass{article}
\usepackage{amsthm}

\newtheorem{innercustomgeneric}{\customgenericname}
\providecommand{\customgenericname}{}
\newcommand{\newcustomtheorem}[2]{%
  \newenvironment{#1}[1]
  {%
   \renewcommand\customgenericname{#2}%
   \renewcommand\theinnercustomgeneric{##1}%
   \innercustomgeneric
  }
  {\endinnercustomgeneric}
}

\newcustomtheorem{customthm}{Theorem}
\newcustomtheorem{customlemma}{Lemma}

\begin{document}

\begin{customthm}{8}\label{eight}
Every theorem must be numbered by hand.
\end{customthm}

Here is a reference to theorem~\ref{eight} and
one to the important lemma~\ref{life-universe-everything}

\begin{customlemma}{42}\label{life-universe-everything}
This lemma explains everything.
\end{customlemma}


\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Theorem without numbering

[Tex/LaTex] Custom theorem numbering

Related Question