title: Suppress chapter numbers & \renewcommand{\chaptername}
body: <p>I am writing a amsbook document in Latex. The \chapter{On Banach Spaces} command produces something like this:</p>
  
  <p><em>CHAPTER 1</em></p>
  
  <p><em>On Banach Spaces</em></p>
  
  <p>I would like it to say</p>
  
  <p><em>CHAPTER</em> </p>
  
  <p><em>On Banach Spaces</em></p>
  
  <p>instead. (No trailing chapter number.)</p>
  
  <p>Why do I want this? I like the layout of amsbook and for the very first chapter I want the leading text to say "INTRODUCTION" then in a next line the title of the introduction. After this introduction I want normal chapter numbering.</p>
  
  <p>This somehow works when I use</p>
  
  <pre><code>\renewcommand{\chaptername}{Introduction}
  </code></pre>
  
  <p>before the introduction chapter, then </p>
  
  <pre><code>\setcounter{chapter}{0}
  
  \renewcommand\chaptername{Chapter}
  </code></pre>
  
  <p>just before the second chapter.</p>
  
  <p>Unfortunately this gives me a "INTRODUCTION 1", however I want "INTRODUCTION". So basically, I like to suppress the chapter number.</p>
  
  <p>(Edited.)</p>