title: What is the lambda equivalent to this Linq expression?
body: <p>What is the lambda equivalent to this Linq expression?</p>
  
  <pre><code>var authorList = new List&lt;Author&gt;();
  var postList = new List&lt;Post&gt;();
  var e = (from p in postList
           from a in authorList
           where p.AuthorId == a.Id
           select new { p, a });
  </code></pre>