Math & Science ⇒ Equation numbering

[Kaspars]

Here is my latex code:

Code: Select all

\documentclass[12pt,a4paper,fleqn]{article}

\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{xltxtra}
\usepackage{polyglossia}
\usepackage{appendix}
\setotherlanguages{english}
\usepackage{graphicx}
\usepackage{amsmath}

\begin{document}
\tableofcontents
\begin{abstract}
\end{abstract}
\section{first section}
\begin{equation}
g(t)=\frac{sin\Omega t}{\pi t}
\end{equation}
\section{second section}
\begin{equation}
g(t)=\frac{sin\Omega t}{\pi t}
\end{equation}
\subsection{Subsection}
\begin{equation}
g(t)=\frac{sin\Omega t}{\pi t}
\end{equation}
\end{document}

If you compile this, you can see something like this:
1. first section
formula ____________(1)
2. second section
formula ____________(2)
2.1. subsection
formula ____________(3)

Please help me with numbering... I want that numbering starts with every new section, so in my file, I want, that it looks like this:
1. first section
formula ____________(1.1)
2. second section
formula ____________(2.1)
2.1. subsection
formula ____________(2.1.1)

Thanks for help

[Frits]

I want that numbering starts with every new section

That can be done by putting the following in the preamble:

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\numberwithin{equation}{section}

You might also want your figures and/or tables in that format, here's how:

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\numberwithin{figure}{section}
\numberwithin{table}{section}

[localghost]

The amsmath manual suggests to use the following.

Code: Select all

\numberwithin{equation}{section}

Thorsten

[Kaspars]

Thanks it, works, but these formulas aren't centred any more, how can I solve this problem?

[localghost]

Drop the fleqn option for the document class. Again I recommend to do some basic reading. And please follow the directions in my last reply.

[Kaspars]

Thanks for your time and answer
I read forum rules too