Update index.html

index.html

@@ -44,6 +44,7 @@ <h2>Introduction to Computer Science</h2>
   <ul>    
     <li><b><a style="text-decoration:none" href="https://teachyourselfcs.com/" target="_blank">Teach Yourself Computer Science</a></b></li>
     <li><b><a style="text-decoration:none" href="https://thecomputersciencebook.com/" target="_blank">The Computer Science Book</a></b></li>
+    <li><a style="text-decoration:none" href="http://infolab.stanford.edu/~ullman/focs.html" target="_blank">Foundations of Computer Science</a></li>        
     <li><a style="text-decoration:none" href="https://media.pearsoncmg.com/bc/abp/cs-resources/products/product.html#product,isbn=013487546X" target="_blank">Computer Science: An Overview</a></li>
   </ul>
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@@ -149,7 +150,6 @@ <h2>Theory of Computing</h2>
     <li><b><a style="text-decoration:none" href="https://www.cs.utexas.edu/~ear/cs341/automatabook/" target="_blank">Automata Computability and Complexity</a></b></li>
     <li><b><a style="text-decoration:none" href="https://math.hws.edu/FoundationsOfComputation/" target="_blank">Foundations of Computation</a></b></li>
     <li><b><a style="text-decoration:none" href="https://palmstroem.blogspot.com/2012/05/lambda-calculus-for-absolute-dummies.html" target="_blank">The Lambda Calculus for Absolute Dummies</a></b></li>
-    <li><a style="text-decoration:none" href="http://infolab.stanford.edu/~ullman/focs.html" target="_blank">Foundations of Computer Science</a></li>    
     <li><a style="text-decoration:none" href="http://infolab.stanford.edu/~ullman/ialc.html" target="_blank">Introduction to Automata Theory, Languages, and Computation</a></li>
   </ul>
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