d{bmatrix}$. </li>
        <li> Identify (approximately by looking at the phase portrait) equilibriums of the above system. What are the stable and unstable equilibriums? </li>
        <li> How are the stable equilibriums related to the matrix $A$? </li>
        <li> Using <script>document.write(notebook_link('pend', 'hopfield_network', link_text='this python notebook'))</script>, implement an image recovery algorithm using Hopfield network. Modify the dynamical system above to memorize a subset of MNIST da