title: Quick way to make 26 macros (one for each letter)
body: <p>Instead of making a macro for each letter, as in</p>
  
  <pre><code>\def\bA{\mathbf{A}}
  ...
  \def\bZ{\mathbf{Z}}
  </code></pre>
  
  <p>Is there a way to loop over a character class (like capital letters) and generate macros for each? I'd also like to do the same for Greek letters (using <code>bm</code> instead of <code>mathbf</code>).</p>