Simple equation editing

Question

I am writing a simple equation in my thesis:

\begin{equation}
\begin{align}
y &= x^{k}\\
\log(y) &= \log(x^{y})\\
\log(y) &= y\log(x)\\
\frac{\log(y)}{\log(x)} &= y
\end{align}
\end{equation}

It works perfectly. However, LaTeX numbers it as 1.1 instead of 1. How could I easily correct it? Thank you!

Answer 1

The report class uses chapter.equation numbering, enclosed by parentheses.

If the equation number should be used alone without referring to the chapter number, then \counterwithout{equation}{chapter} can be used. It requires chngcntr package, however.

\documentclass{report}

\usepackage{amsmath}
\usepackage{chngcntr}

\begin{document}

\chapter{First}
\section{First section}
\subsection{First subsection}



\begin{align}
y &= x^{k}\\
\log(y) &= \log(x^{k})\\
\log(y) &= k\log(x)\\
\frac{\log(y)}{\log(x)} &= k
\end{align}


% Now kick out the chapter number
\counterwithout{equation}{chapter}


\begin{align}
y &= x^{k}\\
\log(y) &= \log(x^{k})\\
\log(y) &= k\log(x)\\
\frac{\log(y)}{\log(x)} &= k
\end{align}

\end{document}

Answer 2

I am writing this answer based on another answer on this site and upon Christian Hupfer's answer here. There are many other useful points on that question too.

%pdfLaTeX
\documentclass{book}
\usepackage{amsmath}

\renewcommand\theequation{\arabic{equation}}

\begin{document}
\chapter{First}
\section{First section}
\subsection{First subsection}

\begin{align}
y &= x^{k}\\
\log(y) &= \log(x^{y})\\
\log(y) &= y\log(x)\\
\frac{\log(y)}{\log(x)} &= y
\end{align}

\end{document}