3-NIRVANA-user-guide/3.2-User-interfaces.md

@@ -579,10 +579,10 @@ possible values or a numeric range.
         solved.
 
     -   `_C.permeability_rel`: relative magnetic permeability 
-        $\mu_{rel} (=\mu /\mu_0,\,\mu_0 =4\pi\cdot 10^{-7}V\cdot m^{-1}\cdot A^{-1}\cdot s^{-1})$.
+        $\mu_{rel} (=\mu /\mu_0,\,\mu_0 =4\pi\cdot 10^{-7}$V/m/A/s.
 
         **Important:** The Gaussian unit system can be mimicked by
-        choosing a value `_C.permeability_rel`$=10^7$ so that
+        choosing a value `_C.permeability_rel`=10<sup>7</sup> so that
         the magnetic permeability is $\mu =4\pi$.
 
 -   `02` (`_C.viscosity`, `_C.viscosity_coeff`)