title: How to detect that two sentences are similar?
body: <p>I want to compute how similar two arbitrary sentences are to each other.  For example:</p>
  
  <blockquote>
    <ol>
    <li>A mathematician found a solution to the problem.</li>
    <li>The problem was solved by a young mathematician.</li>
    </ol>
  </blockquote>
  
  <p>I can use a tagger, a stemmer, and a parser, but I don’t know how detect that these sentences are similar.</p>