Use \max in LaTeX formulas

petebachant · web-flow · commit 663ca5421bee · 2018-07-11T19:34:30.000-04:00
diff --git a/lessons/03_CFL_Condition.ipynb b/lessons/03_CFL_Condition.ipynb
@@ -223,9 +223,9 @@
     "\n",
     "What has happened is that over the time period $\\Delta t$, the wave is travelling a distance which is greater than `dx`.  The length `dx` of each grid box is related to the number of total points `nx`, so stability can be enforced if the $\\Delta t$ step size is calculated with respect to the size of `dx`.  \n",
     "\n",
-    "$$\\sigma = \\frac{u \\Delta t}{\\Delta x} \\leq \\sigma_{max}$$\n",
+    "$$\\sigma = \\frac{u \\Delta t}{\\Delta x} \\leq \\sigma_{\\max}$$\n",
     "\n",
-    "where $u$ is the speed of the wave; $\\sigma$ is called the **Courant number** and the value of $\\sigma_{max}$ that will ensure stability depends on the discretization used. \n",
+    "where $u$ is the speed of the wave; $\\sigma$ is called the **Courant number** and the value of $\\sigma_{\\max}$ that will ensure stability depends on the discretization used. \n",
     "\n",
     "In a new version of our code, we'll use the CFL number to calculate the appropriate time-step `dt` depending on the size of `dx`.  \n",
     "\n"
