Formulae
1. Eloc = E0 + Ep + Es + Em
2. E = E0 + Ep
3. Eloc = E + Es + Em
4. Eloc = E + Es for symmetric crystals = 
5. p = αEloc
6. P = np = nαEloc = χe∈0E
7. 
8. D = ∈E = ∈0∈rE = ∈0E + P
9. 
10. 
11. α = αe + αi + αd
12.
15.
16.
20. pe = Npe = N 4π∈0r3E
21.
22.
23. ∈
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