title: how can I make equations smaller in TeX?
body: <p>how can I make equations smaller in TeX? For example, I want to use the equation environment as follows:</p>
  
  <pre><code>\begin{equation}
  long equation here
  \end{equation}
  </code></pre>
  
  <p>but then it's displayed in a way that's too large to fit in the margin.  I get around this by using:</p>
  
  <pre><code>$ long equation here $
  </code></pre>
  
  <p>but then I don't get the automatic numbering and all the other nice features of equation environments.</p>
  
  <p>secondly, how can I suppress equation numbering for specific equations in \begin{equation}\end{equation}? I'd like equations with no displayed numbers to not count to the total (so if the first 3 equations' numbers suppressed, but the 4th isn't, the 4th equation should be labeled "1").</p>
  
  <p>thanks.</p>