Physical-quantities.md

@@ -42,7 +42,7 @@ E_{\textrm{vel.ext}} = -\int \sum_{\sigma=\{\uparrow,\downarrow\}}\vec{v}_{\sigm
 The total energy `E_tot` is computed as the sum of all these contributions. 
 
 # Densities 
-Densities are computed according to formulas:  
+Densities are computed according to formulas:  (**TODO: there are missing ^2 in some formulas**)
 * `nu`:  
 ![\nu(r) = \frac{1}{2}\sum_{|E_n|<E_c} u_{n,\uparrow}(r)v_{n,\downarrow}^{*}(r)( f_{\beta}(-E_n)-f_{\beta}(E_n) )](https://render.githubusercontent.com/render/math?math=%5Cnu(r)%20%3D%20%5Cfrac%7B1%7D%7B2%7D%5Csum_%7B%7CE_n%7C%3CE_c%7D%20u_%7Bn%2C%5Cuparrow%7D(r)v_%7Bn%2C%5Cdownarrow%7D%5E%7B*%7D(r)(%20f_%7B%5Cbeta%7D(-E_n)-f_%7B%5Cbeta%7D(E_n)%20))
 * `rho_a`: