diff --git a/Trees/SAT_Construction.ipynb b/Trees/SAT_Construction.ipynb
index 3d76093..48045ca 100644
--- a/Trees/SAT_Construction.ipynb
+++ b/Trees/SAT_Construction.ipynb
@@ -4,7 +4,7 @@
   "metadata": {
     "colab": {
       "provenance": [],
-      "authorship_tag": "ABX9TyOsCrbBAxlKgc659gtbRD52",
+      "authorship_tag": "ABX9TyPHpSfq+tkEJ6pqN8jebPBC",
       "include_colab_link": true
     },
     "kernelspec": {
@@ -270,7 +270,7 @@
         "\n",
         "1. Top left element $r_{0,0}$ is the first data element\n",
         "\n",
-        "$$ r_{00} \\Leftrightarrow x_{1}$$\n",
+        "$$ r_{00} \\Leftrightarrow x_{0}$$\n",
         "\n",
         "2. Remaining elements $r_{0,1:}$ must be false\n",
         "\n",