title: How !(!A || B) should be simplified
body: <p>This is a first-year-of-university question but I just cannot get around it.</p>
  
  <pre><code>!(!A || B)
  </code></pre>
  
  <p>simplified is...?</p>
  
  <p>I have tried</p>
  
  <pre><code>!(A || B) = !A &amp;&amp; !B 
  </code></pre>
  
  <p>So A = !A  ,   B = B</p>
  
  <pre><code>!!A &amp;&amp; B = A &amp;&amp; !B
  </code></pre>
  
  <p>But it does not work!!! any ideas?</p>