[Tex/LaTex] Theorem/Definition/Lemma/etc independent numbering in Lyx

koma-scriptlyxnumberingtheorems

I am using the Koma-script book class in Lyx. By default, theorems, definitions, lemmas, and so on, follow the same numbering. So after "Theorem 1" comes "Definition 2", then "Lemma 3", and so on, even though "Definition 2" is actually the first definition in the document.

I would like theorems and definitions to be numbered independently. How do I accomplish this (in Lyx)?

Best Answer

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.

Related Solutions

[Tex/LaTex] Theorem/Definition/Lemma problem — Numbering

Similar to the solution at this question and section 3 of the amsthm documentation:

enter image description here

\documentclass[11pt,a4paper]{report}
\usepackage{amsthm}

\theoremstyle{plain}
\newtheorem{thm}{Theorem}[chapter] % reset theorem numbering for each chapter

\theoremstyle{definition}
\newtheorem{defn}[thm]{Definition} % definition numbers are dependent on theorem numbers
\newtheorem{exmp}[thm]{Example} % same for example numbers

\newcommand{\chaptercontent}{
\section{Basics}
\begin{defn}Here is a new definition.\end{defn}
\begin{thm}Here is a new theorem.\end{thm}
\begin{thm}Here is a new theorem.\end{thm}
\begin{exmp}Here is a good example.\end{exmp}
\subsection{Some tips}
\begin{defn}Here is a new definition.\end{defn}
\section{Advanced stuff}
\begin{defn}Here is a new definition.\end{defn}
\subsection{Warnings}
\begin{defn}Here is a new definition.\end{defn}
}

\begin{document}
\tableofcontents
\part{Addition and Subtraction}
\chapter{Addition} \chaptercontent
\chapter{Subtraction} \chaptercontent
\part{Multiplication and Division}
\chapter{Multiplication} \chaptercontent
\chapter{Division} \chaptercontent
\end{document}

[Tex/LaTex] Theorem/Definition/Lemma problem — Numbering in Beamer

You need to number subsections within sections and theorems within sections, to achieve what you want.

\numberwithin{subsection}{section}
\numberwithin{theorem}{subsection}

Also, you need to declare

\setbeamertemplate{theorems}[numbered]

otherwise they are not numbered at all.

MWE:

\documentclass{beamer}

\setbeamertemplate{theorems}[numbered]
\numberwithin{subsection}{section}
\numberwithin{theorem}{subsection}

\begin{document}
\section{Functions}
\subsection{Basics}
\begin{frame}
\frametitle{A Theorem on Infinite Sets}
\begin{theorem}
There exists an infinite set.
\end{theorem}
\begin{proof}
This follows from the axiom of infinity.
\end{proof}
\begin{example}[Natural Numbers]
The set of natural numbers is infinite.
\end{example}
\end{frame}
\end{document}

enter image description here

Note that I haven't changed the fact that all theorem-like environments share the same counter.

Best Answer

Related Solutions

[Tex/LaTex] Theorem/Definition/Lemma problem — Numbering

[Tex/LaTex] Theorem/Definition/Lemma problem — Numbering in Beamer

Related Question