title: Functional Dependencies - how to eliminate redundant left hand side attributes?
body: <p>I am having a lot of trouble understanding this concept in one of my classes.</p>
  
  <p>Here is an example problem. Given this table and FDs eliminate the redundant left hand side attributes:</p>
  
  <ul>
  <li>Table1(X, Z, Y, W, S, T, U)
  <ul>
  <li>X->Z</li>
  <li>UZ->YST</li>
  <li>Y->W</li>
  <li>W->S</li>
  </ul></li>
  </ul>
  
  <p>To me it looks like there are no redundant left hand side attributes, as the closure of U+ is YST and the closure of Z+ is also YST, which to me does not allow for any removal on the left hand side. Is this correct? Thanks.</p>