@@ -34,7 +34,7 @@ _(based on chapters 17–18 of the book)_
* Group velocity $v=\hbar^{-1}\partial E(k)/\partial k$
* Effective mass $m_{eff} = \hbar^2\left(d^2 E(k)/dk^2\right)^{-1}$
* Density of states $g(E) = \sum_{\textrm{FS}}dk \times (dn/dk) \times (dk/dE)$ the amount of states per infinitesimal interval of energy at each energy.
* Density of states $g(E) = \sum_{\textrm{FS}} (dn/dk) \times (dk/dE)$ the amount of states per infinitesimal interval of energy at each energy.
A simple check that everything is correct is the free electron model:
