diff --git a/Notebooks/Chap09/9_2_Implicit_Regularization.ipynb b/Notebooks/Chap09/9_2_Implicit_Regularization.ipynb
index 29c240c..af91cbe 100644
--- a/Notebooks/Chap09/9_2_Implicit_Regularization.ipynb
+++ b/Notebooks/Chap09/9_2_Implicit_Regularization.ipynb
@@ -4,7 +4,6 @@
   "metadata": {
     "colab": {
       "provenance": [],
-      "authorship_tag": "ABX9TyOR3WOJwfTlMD8eOLsPfPrz",
       "include_colab_link": true
     },
     "kernelspec": {
@@ -140,7 +139,7 @@
         "    fig.set_size_inches(7,7)\n",
         "    ax.contourf(phi0mesh, phi1mesh, loss_function, 256, cmap=my_colormap);\n",
         "    ax.contour(phi0mesh, phi1mesh, loss_function, 20, colors=['#80808080'])\n",
-        "    ax.set_xlabel('$\\phi_{0}$'); ax.set_ylabel('$\\phi_{1}$')\n",
+        "    ax.set_xlabel(r'$\\phi_{0}$'); ax.set_ylabel(r'$\\phi_{1}$')\n",
         "\n",
         "    if grad_path_typical_lr is not None:\n",
         "        ax.plot(grad_path_typical_lr[0,:], grad_path_typical_lr[1,:],'ro-')\n",
@@ -335,4 +334,4 @@
       }
     }
   ]
-}
+}
\ No newline at end of file