N. Notes

This appendix collects various notes on the material. This sort of material is often given in footnotes at the bottom of the text. However, such a footnote is distracting. You tend to read them even if they are probably not really that important to you. Also, footnotes have to be concise, or they make a mess of the main text.

- N.1 Why this book?
- N.2 History and wish list
- N.3 Nature and real eigenvalues
- N.4 Are Hermitian operators really like that?
- N.5 Why boundary conditions are tricky
- N.6 Is the variational approximation best?
- N.7 Shielding approximation limitations
- N.8 Why the s states have the least energy
- N.9 Explanation of the band gaps
- N.10 A less fishy story
- N.11 Better description of two-state systems
- N.12 Second quantization in other books
- N.13 Combining angular momentum factors
- N.14 The electric multipole problem
- N.15 A tenth of a googol in universes
- N.16 A single Slater determinant is not exact
- N.17 Generalized orbitals
- N.18
Correlation energy

- N.19 Ambiguities in electron affinity
- N.20 Why Floquet theory should be called so
- N.21 Superfluidity versus BEC
- N.22 The mechanism of ferromagnetism
- N.23 Fundamental assumption of statistics
- N.24 A problem if the energy is given
- N.25 The recipe of life
- N.26 Physics of the fundamental commutators
- N.27 Magnitude of components of vectors
- N.28 Adding angular momentum components
- N.29 Clebsch-Gordan tables are bidirectional
- N.30 Machine language Clebsch-Gordan tables
- N.31 Existence of magnetic monopoles
- N.32 More on Maxwell’s third law
- N.33 Setting the record straight on alignment
- N.34 NuDat 2 data selection
- N.35 Auger discovery