Changelog

This changelog records notable reader-facing changes: new sections, convention changes, major corrections, page reorganizations, and review milestones. It is not a complete version-control log.

Detailed file-level history belongs in repository history. This page is for changes a reader may need to know when comparing notes, citations, or older saved pages.

2026-07-03

• Expanded the Learn prerequisites with targeted readiness checklists for mathematics, physics, and a self-diagnostic quiz.
• Expanded the Learn roadmaps with quantum information, quantum chemistry, and condensed-matter routes.
• Completed the Learn convention suite covering units, bra-ket notation, inner products, Fourier transforms, wavefunction normalization, operators, commutators, tensor-product ordering, spin and Pauli matrices, angular momentum, density matrices, and probability-measurement notation.
• Added trust-maintenance policy pages for citation standards, evidence labels, versioning and review, error reporting, contribution guidance, and this changelog.

Changelog Rules

Record changes when they affect:

• canonical-home placement,
• conventions,
• formulas or signs,
• page status,
• references for important claims,
• major navigation,
• major figures,
• interpretation-sensitive wording,
• reader-facing correction history.

Do not record every typo fix, local prose cleanup, or internal-only build change unless it affects reader trust.

Correction Entries

When a correction changes a formula, sign, normalization, or conclusion, include:

• the date,
• the affected page,
• the old issue in plain language,
• the corrected statement,
• whether the page status changed.

References

• Committee on Publication Ethics, Core Practices, for correction and transparency principles.
• The Turing Way Community, The Turing Way: A Handbook for Reproducible, Ethical and Collaborative Data Science, for open maintenance practices.

Exercises

1. A typo is fixed in an exercise explanation but the formula and solution are unchanged. Does it need a changelog entry?

Solution

Usually no. The changelog is for notable reader-facing changes, not every copy edit.

2. A Fourier transform sign convention changes on the convention page. Does it need a changelog entry?

Solution

Yes. Convention changes can affect many formulas and reader notes, so they should be recorded clearly.