TODO

=== 15 Juni 2022 ===

- 2nd order diagrams
- Luttinger results for self-energy
+ Compare with Romans limit: Wigner crystal works for small occupation
- 4th cumulant - Ivanov paper J Phys. A: Math. Theor. 46 (2013) 085003
- Luttinger theorem


=== 8 June 2022 ===

+ Physical density
+ Calculate Eq. 78 for p_F L ~ 1 though p_F << 1
- Compare with Romans limit


=== 17 May 2022 ===

- Physical density
+ Expansion over lambda
+ L dependence 
+ Summarize rezults
+ V_1 to K correspondence
+ Prove all cumulants are real
- Check charge density wave in Giamarchi