title: & vs * and | vs +
body: <p>When doing <em>boolean</em> array comparison, is there any advantage / convention to using <code>&amp;</code> in place of <code>*</code> or <code>|</code> in place of <code>+</code>?  Are these always equivalent?</p>
  
  <p>(if these are in the documentation, a link would probably be an acceptable answer, but my naive search for 'numpy ampersand' and 'numpy elementwise boolean comparison' didn't yield anything relevant)</p>