diff --git a/Notebooks/Chap03/3_3_Shallow_Network_Regions.ipynb b/Notebooks/Chap03/3_3_Shallow_Network_Regions.ipynb
index b1542cd..8578086 100644
--- a/Notebooks/Chap03/3_3_Shallow_Network_Regions.ipynb
+++ b/Notebooks/Chap03/3_3_Shallow_Network_Regions.ipynb
@@ -4,7 +4,7 @@
   "metadata": {
     "colab": {
       "provenance": [],
-      "authorship_tag": "ABX9TyN/5in7dmMxKCsN/wAMWi0P",
+      "authorship_tag": "ABX9TyPCoVxVKyXd3JMSh4p0Bo+9",
       "include_colab_link": true
     },
     "kernelspec": {
@@ -62,7 +62,7 @@
       "source": [
         "The number of regions $N$ created by a shallow neural network with $D_i$ inputs and $D$ hidden units is given by Zaslavsky's formula:\n",
         "\n",
-        "\\begin{equation}N = \\sum_{j=0}^{D_{i}}\\binom{D}{j}=\\sum_{j=1}^{D_{i}} \\frac{D!}{(D-j)!j!} \\end{equation} <br>\n",
+        "\\begin{equation}N = \\sum_{j=0}^{D_{i}}\\binom{D}{j}=\\sum_{j=0}^{D_{i}} \\frac{D!}{(D-j)!j!} \\end{equation} <br>\n",
         "\n"
       ],
       "metadata": {