diff --git a/chapters/project/FinalProject-2023Fall.ipynb b/chapters/project/FinalProject-2023Fall.ipynb
index 69263bf..5036b52 100644
--- a/chapters/project/FinalProject-2023Fall.ipynb
+++ b/chapters/project/FinalProject-2023Fall.ipynb
@@ -256,15 +256,16 @@
     "### Appendix\n",
     "Exposure to heat extremes is associated with premature death. Assume the empirical relationship between temperature and excess mortality rate for the 45- to 64-year-old population can be estimated by:\n",
     "\n",
-    "$$ \\text{Mortality}=  \\left\\{\n",
-    "\\begin{array}{ll}\n",
+    "$$ \n",
+    "\\text{Mortality}=  \n",
+    "\\begin{cases}\n",
     "      -0.54 * T - 0.2,  T \\le -10\\\\\n",
     "      -0.25 * T + 2.8, -10 < T \\le 15 \\\\\n",
-    "      -0.1 * T + 0.55, 15 < T \\le 22 \\\\\n",
+    "      -0.1 * T + 0.55, 15 < T \\le 22 \\tag{1} \\\\\n",
     "      0.5 * T - 12.65, 22 < T \\le 25 \\\\\n",
     "      0.75 * T - 18.9, T > 25 \\\\\n",
-    "\\end{array} \n",
-    "\\right. \\tag{1}$$ \n",
+    "\\end{cases}\n",
+    "$$ \n",
     "\n",
     "where $\\text{Mortality}$ is the excess mortality (per 100k) for the 45- to 64-year-old population and $T$ is the temperature (°C). \n"
    ]