Electrostatics.md

@@ -25,8 +25,8 @@ in the left panel.
 ## Additional information
 
 This is the electrostatic 2D model of a microstrip.  Only one half of the system
-is represented.  Symmetry is accounted for by means of a Neumann boundary
-condition ($`\mathbf{n}\cdot\mathbf{d}=0`$) on the symmetry axis. The voltage of the electrode, which is
+is represented.  Symmetry is accounted for by means of a homogeneous Neumann boundary
+condition  on the symmetry axis. The voltage of the electrode, which is
 not part the domain of analysis, is set to 1mV and is thus imposed as a
 Dirichlet boundary condition.  The electrode is laid on a dielectric slab of
 relative dielectric permeability equal to 9.8, and which is grounded on its