How to change Appendix chapter name

Question

I have a long appendix which includes a lot of equations and figures.
My document class is report.
In order to have a separate appendix section, I used:
appendix
chapter{The first appendix}

The outcome shows like this

Chapter A
The first appendix

How can I change it to:

Appendix A
The first appendix

I also tried
chapter*{Appendix: The First Appendix}
addcontentsline{toc}{chapter}{Appendix: The First Appendix}

But in this way, my equation number does not start with A.1. This will not work for me.

user2478 · Answer

I do not really understand your problem. However, maybe that you are looking fro something like this:

documentclass{report}
usepackage[english]{babel}
usepackage{blindtext}

makeatletter
defsetChapterprefix#1{gdef@Prefix{#1}}
setChapterprefix{}
renewcommand*l@chapter[2]{%
  ifnum c@tocdepth >m@ne
    addpenalty{-@highpenalty}%
    vskip 1.0em @plusp@
    setlength@tempdima{1.5em}%
    begingroup
      parindent z@ rightskip @pnumwidth
      parfillskip -@pnumwidth
      leavevmode bfseries
      advanceleftskip@tempdima
      hskip -leftskip
      @Prefix 
      #1nobreakhfil nobreakhb@xt@@pnumwidth{hss #2}par
      penalty@highpenalty
    endgroup
  fi}
    makeatother
begin{document}
    tableofcontents
    chapter{Introduction to Quantum Electrodynamics}
        blindtext
    appendix
    addtocontents{toc}{protectsetChapterprefix{Appendix }}
    chapter{Calculus of Variations}
        blindtext
    chapter{Digital Signal Processing}
        blindtext
end{document}

David Hammen · Answer

As xport noted, you probably have an old (very old) version of TeX. Newer version don't have this problem. The best solution is to update; you probably have a lot of other since-corrected misfeatures in addition to this one. If you can't update, try the following:

appendix
renewcommandchaptername{Appendix}
chapter{The first appendix}

Mori · Answer

Use the following code within the chapter not the preamble:

setcounter{chapter}{0}
appendix
makeatletter
renewcommand{@chapapp}{Appendix}
makeatother

kmsdev · Answer

Before starting the chapter that will be your appendix insert the following commands:

renewcommandchaptername{Appendix}                      % hereafter, chapters are called "Appendix"
renewcommandthechapter{Alph{chapter}}                % chapter number in alph letters
renewcommandthesection{Alph{chapter}.Roman{section}} % make sections "A.I"
setcounter{chapter}{0}                                  % start numbering chapters from 1 on again

Yvon · Answer

This might be a corner case but for me, none of the answers works.
Because I'm using titlesec to change all other title formats, the chapter name is fixed by me using titleformat in the preamble.
Adding the following command right before the appendix can change the title name for me
appendix % change numbering
titleformat{chapter}{normalfontlarge}{Appendix thechapter:}{1em}{} % change keyword
input{../maintext/AppendixA} % load appendix (starting with chapter)

How to change Appendix chapter name

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