title: Lossless, dependency preserving BCNF
body: <p>The following relations are given:</p>
  
  <p>R1 = {A, B, C}</p>
  
  <p>R2 = {C, D}</p>
  
  <p>R3 = {D, E}</p>
  
  <p>The task is to find a set of function dependencies to satisfy BCNF (lossless, and dependency preserving). I think that this is not possible here.</p>
  
  <p>Without dependency preserving i got this:</p>
  
  <p>A -> B, C</p>
  
  <p>C -> A, D</p>
  
  <p>D -> A, E</p>
  
  <p>Is this correct and is it possible to find a dep. pres. set?</p>
  
  <p>Thanks in advance.</p>