How can I change the labelling of an equation?

Question

How can I change the labelling of an equation? Instead of (1.1), (1.2) I want to have (Equation 1.1), (Equation 1.2), ...

Document class is scrbook.

I use the following related packages:

\usepackage{amsmath,amssymb,amsthm}

Example of an equation:

\begin{equation}
\label{eqn:example}
a+b=c
\end{equation}

Answer 1

Since you're loading the amsmath package, you could make use of that package's \tagform@ macro to achieve your objective.

Note that you will not be able to use \eqref to create cross-references to equations; I suggest you load the cleveref package and use \cref instead.

\documentclass{scrbook}

\usepackage{amsmath,amssymb,amsthm}
\makeatletter
\def\tagform@#1{\maketag@@@{\ignorespaces(Equation #1\unskip\@@italiccorr)}}
\makeatother

\usepackage[noabbrev,capitalize]{cleveref}
\begin{document}

\setcounter{chapter}{1}
\begin{equation} 
\label{eqn:example}
a+b=c
\end{equation}

A cross-reference to \cref{eqn:example}.
\end{document}

---

Addendum: If you're willing to load the mathtools package (which automatically loads amsmath), you could make use of the \newtagform macro. (I'm not posting a second screenshot, as the output of the following example looks just like the one above.)

\documentclass{scrbook}

\usepackage{mathtools,amssymb,amsthm}
\newtagform{Eq}{(Equation }{)}
\usetagform{Eq}

\usepackage[noabbrev,capitalize]{cleveref}
\begin{document}
\setcounter{chapter}{1}
\begin{equation} 
\label{eqn:example}
a+b=c
\end{equation}

A cross-reference to \cref{eqn:example}.
\end{document}