title: What's the difference between System.Tuple and (,)?
body: <p>Background: I am using two methods from different libraries; one uses <code>System.Tuple&lt;double,double&gt;</code> and the other uses <code>(double,double)</code> for arguments. I am finding myself unable to utilize both methods without doing extra work to convert a <code>System.Tuple</code> to a <code>(,)</code>. </p>
  
  <p>What is the difference between <code>System.Tuple&lt;t1,t2&gt;</code> and <code>(t1,t2)</code>? </p>