Suppressing the 'Appendices' page
For the benefit of others who may have this problem but not have \appendixpage
anywhere in their code, there are (at least?) two ways the Appendix page can be enabled:
- Via the
\appendixpage
command, as mentioned above.- Remove this line from your code and the Appendix page will disappear.
- The
page
option of theappendix
package.\usepackage[page]{appendix}
WILL include the Appendix page.\usepackage{appendix}
will NOT include the Appendix page.
Delete the command \appendixpage
.
The fact that you have to remove the line
\appendixpage
is already stated in Ian's answer.
There is also an error in your code. If you want the appendix "Mathematical Appendix" not to be numbered, but you want it to appear in the ToC, you have to issue the command
\addappheadtotoc
just after the line
\chapter*{Mathematical Appendix}
and not before it, otherwise you get a wrong page number in the ToC.
This is how your MWE should be changed:
\documentclass[12pt,openany]{book}
\usepackage{appendix}
\renewcommand\appendixtocname{Mathematical Appendix}
\begin{document}
\frontmatter
\tableofcontents
\mainmatter
\chapter{The first chapter}
Bla bla
\appendix
\chapter*{Mathematical Appendix}
\addappheadtotoc
\renewcommand\thesection{A.\arabic{section}}
Bla bla
\section{Functions}
Bla bla
\end{document}
Output (ToC):