Work on book text.#25

Draft

jochym wants to merge 25 commits intomainfrom

Commits on Jan 2, 2026

Book text into book branch
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Initial plan
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Translate Introduction and Basic Properties section to English

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Translate Hartree-Fock and Self-consistent field sections

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Translate Electronic correlations and start Electron gas section

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Continue translating Electron gas section - Fermi energy and density

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Fix wave vector components in electron gas section

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Complete translation of Section 1.5 Electron gas

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Replace "spin direction" with "parallel/opposite spins" terminology

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Fix terminology: "Pauli principle" to "Pauli exclusion principle"

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Fix spelling: "Koopman's" to "Koopmans'" theorem

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Change "is equal" to "is the same" for stylistic preference

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Change "entire space" to "entire volume" per author preference

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Merge pull request #26 from jochym/copilot/sub-pr-25
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Add GitHub Copilot instructions for repository (#24) (#27)

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Document book branch LaTeX manuscript structure and Quarto migration goal in copilot-instructions.md (#29)

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Commits on Jan 3, 2026