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  <table cellpadding="10"> <tr> <td> <div class="headertitle">    
      <div class="title">Eigenvalue solvers </div>
      </div></td>
      <td> &nbsp;&nbsp;&nbsp;&nbsp;</td>
      <td> <button class="TopMenuButton"><div><a href="#ExternalSolvers">Installation</a></div></button></td>
      <td> <button class="TopMenuButton"><div><a href="#BasicUse">Basic use</a></div></button></td>
      <td> <button class="TopMenuButton"><div><a href="#AdvancedUse">Advanced use</a></div></button></td>
      <td> <button class="TopMenuButton"><div><a href="#GeneralEigenProblem">Methods</a></div></button></td>
      <td> <button class="TopMenuButton"><div><a href="#EigenProblem_Base">Linear eigenproblem</a></div></button></td> 
      <td> <button class="TopMenuButton"><div><a href="#polynomial">Polynomial</a></div></button></td>
      <td> <button class="TopMenuButton"><div><a href="#non_linear">Non-linear</a></div></button></td>
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    </table>
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