From f45994ebc830a1200c347c583fd619a8db1cdb2c Mon Sep 17 00:00:00 2001
From: Mark Dewing <markdewing@gmail.com>
Date: Wed, 6 Jul 2016 14:20:26 -0500
Subject: [PATCH] More explanation about the integral.

---
 Variational/Variational_Hydrogen.ipynb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Variational/Variational_Hydrogen.ipynb b/Variational/Variational_Hydrogen.ipynb
index 12c98a7..2166ce9 100644
--- a/Variational/Variational_Hydrogen.ipynb
+++ b/Variational/Variational_Hydrogen.ipynb
@@ -146,7 +146,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Construct the integral in spherical coordinates  (There should be an additional factor of $4 \\pi$, but it will cancel since it occurs in the numerator and denominator)"
+    "The integration occurs in 3D over the electron coordinates.  Because the integrand only has a dependence on $r$, it can be converted to spherical coordinates, and reduced to a 1D integral over $r$. (There should be an additional factor of $4 \\pi$, but it will cancel since it occurs in the numerator and denominator)"
    ]
   },
   {