[Tex/LaTex] Missing space after Appendix

elsarticlespacing

I am working on a document that has an appendix. I would like it to have the heading: "Appendix A. Tasks for Progressive Formulation"

This is the code I am using

 \appendix

 \newpage

 \section{Tasks for Progressive Formulation}

The result I get is missing the space between the word Appendix and the letter A. It shows like this:

AppendixA. Tasks for Progressive Formulation

How can I force a white space between Appendix and the letter?

Edit: more code

\documentclass{elsarticle}

\usepackage[english]{babel} 
\usepackage{booktabs} 
\usepackage[autostyle, english = american]{csquotes} 
\usepackage{float} 
\restylefloat{figure} 
\usepackage[margin=3cm]{geometry} 
\usepackage{graphicx} 
\usepackage{lineno} 
\usepackage{multirow} 
\usepackage{natbib} 
\usepackage{tabulary} 


\begin{document}

\appendix
\newpage
\section{Tasks for Progressive Formulation}
\end{document}

Best Answer

It's a wrong choice by elsarticle.cls that has

\def\appendixname{Appendix }

with a space, whereas babel correctly does 

\renewcommand{\appendixname}{Appendix}

with no space. You can reinstate the behavior expected by elsarticle doing

\addto\captionsenglish{\renewcommand{\appendixname}{Appendix }}

Here's a minimal example (the other packages you load have nothing to do with the issue) But, really, elsarticle should do di \documentclass{elsarticle}

\usepackage[english]{babel}
\addto\captionsenglish{\renewcommand{\appendixname}{Appendix }}

\begin{document}

\appendix
\section{Tasks for Progressive Formulation}
\end{document}

But, really, elsarticle should do differently: the code from line 748 to line 758 in elsarticle.cls should be

\renewcommand\appendix{\par
  \setcounter{section}{0}%
  \setcounter{subsection}{0}%
  \setcounter{equation}{0}
  \gdef\thefigure{\@Alph\c@section.\arabic{figure}}%
  \gdef\thetable{\@Alph\c@section.\arabic{table}}%
  \gdef\thesection{\appendixname\space\@Alph\c@section}%
  \@addtoreset{equation}{section}%
  \gdef\theequation{\@Alph\c@section.\arabic{equation}}%
}

without a redefinition of \appendixname and adding the space in the redefinition of \thesection. A fixed tag should be just a tag, with no “formatting instructions” that belong elsewhere.

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