fix a lot of style issues authored by Philipp Rüssmann's avatar Philipp Rüssmann
###### Basic theory {#basic_theory} # Basic theory
` - `[`The`` ``Green`` ``function`` ``method`](The_Green_function_method "wikilink")\
` -`[`The`` ``Green`` ``function`` ``approach`](The_Green_function_approach "wikilink")\ - [The Green function method](The_Green_function_method)
` -`[`Free`` ``Green`` ``function`](Free_Green_function "wikilink")\ - [The Green function approach](The_Green_function_approach)
` -`[`Boundary`` ``condition`](Boundary_condition "wikilink")\ - [Free Green function](Free_Green_function)
` - `[`Scattering`` ``theory`](Scattering_theory "wikilink")` `\ - [Boundary condition](Boundary_condition)
` -`[`Single-site`` ``scattering`](Single-site_scattering "wikilink")\ - [Scattering theory](Scattering_theory)
` -`[`Multiple`` ``scattering`](Multiple_scattering "wikilink")\ - [Single-site scattering](Single-site_scattering)
` - `[`KKR`` ``as`` ``Green`` ``function`` ``method`](KKR_as_Green_function_method "wikilink")\ - [Multiple scattering](Multiple_scattering)
` - `[`Dyson`` ``equation`](Dyson_equation "wikilink")\ - [KKR as Green function method](KKR_as_Green_function_method)
` - `[`KKR`` ``secular`` ``equation`](KKR_secular_equation "wikilink")` `\ - [Dyson equation](Dyson_equation)
` - `[`Full`` ``potential`` ``treatment`` ``within`` ``KKR`](Full_potential_treatment_within_KKR "wikilink")\ - [KKR secular equation](KKR_secular_equation)
` - `[`Total`` ``energy`](Total_energy "wikilink")\ - [Full potential treatment within KKR](Full_potential_treatment_within_KKR)
` - `[`Charge`` ``density`](Charge_density "wikilink")\ - [Total energy](Total_energy)
` - `[`Band`` ``energy`](Band_energy "wikilink")\ - [Charge density](Charge_density)
` - `[`Exchange-correlation`` ``energy`](Exchange-correlation_energy "wikilink") - [Band energy](Band_energy)
- [Exchange-correlation energy](Exchange-correlation_energy)