numberingtheorems
I am using LaTeX theorem style where I have at the top:
\newtheorem{theorem}{Theorem}
\newtheorem{definition}{Definition}
\newtheorem{lemma}{Lemma}
and then I use
\begin{(theorem|definition|lemma)}
...
\end{(theorem|definition|lemma)}
This numbers the theorems, definitions, and lemmas separately. Is where a way to do it where the definitions aren't numbered (but still use the rest of the theorem style)?
Go to Document > Settings > Modules
Click on "Theorems (AMS, Numbered by Type)"
The description is as follows:
Defines theorem environments and the proof environment using
the extended AMS machinery. Both numbered and unnumbered
types are provided. Contrary to the plain AMS Theorem
module, the different theorem types provided here each have
a separate counter (e.g., theorem 1, theorem 2, lemma 1,
proposition 1, theorem 3, lemma 2, ..., as opposed to
theorem 1, theorem 2, lemma 3, proposition 4, ...). The
numbering's scope is the whole document. For chapter- and
section-wide numbering, use one of the 'within
Sections'/'within Chapters' modules, respectively.
If you disable the automatic creation of Theorem blocks by beamer and do like the usual way using amsthm you can format all easily.
So, the option notheorems disable the automatic process and then you have to define the environments by yourself. Thus you can specify the style and the numbering.
\documentclass[mathserif,notheorems]{beamer} % option notheorems
\usepackage{amsthm}
\setbeamertemplate{theorems}[numbered] % to number
\theoremstyle{plain} % insert bellow all blocks you want in italic
\newtheorem{theorem}{Theorem}[section] % to number according to section
\theoremstyle{definition} % insert bellow all blocks you want in normal text
\newtheorem{definition}{Definition}[section] % to number according to section
\newtheorem*{idea}{Proof idea} % no numbered block
\usepackage{graphicx}
\usepackage{tcolorbox}
\begin{document}
\section[test]{this is a test}
\frame{
\frametitle[short frame title]{title}
\begin{tcolorbox}
\begin{definition} This is a definition. \end{definition}
\begin{theorem} This is a theorem. \end{theorem}
\begin{idea} This is a proof idea. \end{idea}
\begin{proof} This is a proof. \end{proof}
\end{tcolorbox}
}
\end{document}
If you don't want to do by hand as above, then:
For 1: no solution yet.
For 2 and 3 use
\theoremstyle{definition}
\newtheorem*{idea}{Proof idea}
For 5 according to the user guide (pg 119), use the option envcountsect within the document class
\documentclass[mathserif,envcountsect]{beamer}
Note: 4 is not related with numbering. Just use inside the frame
\frametitle[short frame title]{title}
to insert a title for it.
Best Answer
You can get unnumbered theorem-like environment loading either amsthm or ntheorem and saying
These two packages introduce also the concept of "theorem style" that helps to get, for example, upright text inside the
definitionenvironment. For amsthm it would beand similarly for ntheorem