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

@@ -579,7 +579,7 @@ 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/m/A/s.
+        $\mu_{rel}$ ($=\mu/\mu_0,\,\mu_0 =4\pi\cdot 10^{-7}$ V/m/A/s)
 
         **Important:** The Gaussian unit system can be mimicked by
         choosing a value `_C.permeability_rel`=10<sup>7</sup> so that