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      <div class="content">
         <h1>Lower bound for the Ramsey number R(4)</h1>
         <introduction>
            <p>We show that the the Ramsey number R(4) is greater than 17 by presenting a graph with 17 vertices that has clique and independence
               numbers equal to three. The Matgraph <tt>alpha</tt> and <tt>omega</tt> functions require the Optimization Toolbox.
            </p>
         </introduction>
         <h2>Contents</h2>
         <div>
            <u