title: Logical Equivalence Law for Removing Parentheses
body: <p>I have a problem problem such as:</p>
  
  <blockquote>
    <p>¬P ∨ (Q ∨ R)</p>
  </blockquote>
  
  <p>I used the law that :</p>
  
  <blockquote>
    <p>¬P ∨ (Q ∨ R) ≡ ¬P ∨ Q ∨ R</p>
  </blockquote>
  
  <p>But I do not remember the name of the law. Can anybody help me?</p>