Electrostatics.md

@@ -26,7 +26,7 @@ in the left panel.
 
 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 ($`\vec{n}\cdot\vec{d}=0`$) on the symmetry axis. The voltage of the electrode, which is
+condition ($`\mathbf{n}\cdot\mathbf{d}=0`$) 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