Update 5_atoms_and_lcao_solutions.md

src/5_atoms_and_lcao_solutions.md

@@ -57,9 +57,8 @@ $$
 1.
 
 $$
-    H_{\mathcal{E}} = eR\mathcal{E},
+    H_{\mathcal{E}} = ex\mathcal{E},
 $$
-where R is the distance between the negatively charged electrons and the positive charged nuclei.
 
 2.
 $$