title: how to Simplify the the boolean function into POS and SOP forms?
body: <p>I'd like to simplify this boolean function: f(a,b,c,d)=∑(1,3,5,8,9,11,15) to its minimal SOP and POS forms.</p>
  
  <p>My solution is:</p>
  
  <p>SOP: A'·B'·C'·D + A'·B'·C·D + A'·B·C'·D + A·B'·C'·D' + A·B'·C'·D' + A·B'·C·D + A·B·C·D</p>
  
  <p>POS: (A+B+C+D)·(A+B+C'+D')·(A+B'+C+D')·(A'+B+C+D)·(A'+B+C+D')·(A'+B+C'+D')·(A'+B+C'+D')</p>
  
  <p>Is it right?
  Is there more to do?</p>