(solid-state:notes)=
# Notes about Solid State Physics

(solid-state:crystals)=
## Crystals

Primary lattice vectors, $\mathbf{a}_j$, defines periodicity (and symmetry) of the lattice,...

$$f(\mathbf{r}) = f \left( \mathbf{r} + \sum_j n_j \mathbf{a}_j \right) \ ,$

with $n_j \in \mathbb{Z}$.

(solid-state:crystals:bloch-thm)=
### Bloch's theorem

...