Copyright & Attribution
© 2026 Haobai Wang · For protected material lawfully owned by the author.
Reading and teaching links
The website is free to read. Teachers are welcome to share official webpage links with students. Provided offline packages may be used for personal reading with attribution and rights notices retained. These facilities grant no general republication, adaptation, redistribution or commercial reissue rights.
Separate material policies
| Material | Current policy |
|---|---|
| Book text and arrangement | Rights reserved in original expression, selection and arrangement lawfully owned by the author; no CC BY-SA 4.0 adoption. |
| Project software | Managed separately; no general open-source licence selected. Text policy does not relicense code. |
| Project-created cover and diagrams | Record provenance and AI assistance per item; project creation does not automatically establish copyright. |
| Third-party software | markdown-it 14.1.0 — MIT; mathjax-full 3.2.2 — Apache-2.0; beautifulsoup4 4.12.3 — MIT; soupsieve 3.0.4 — MIT. Original notices are retained with distributions. |
| Images, quotations and other third-party material | Original holders and existing permissions remain; attribution is not evidence of a reuse licence. |
Statutory exceptions, existing third-party permissions and applicable platform terms remain effective. No exclusive rights are claimed over mathematical facts, ideas, public-domain material or others’ content. No general reuse rights in protected author-owned material are granted without further authorization.
AI-assisted creation
ChatGPT, Codex and related tools assist research, drafting, mathematical discussion, editing, translation and website engineering. Haobai Wang directs ideas and narrative, selection, revision and editorial adoption. AI tools are not listed as human authors or reviewers.
No blanket copyright claim is made over automatically generated text, code or images. Rights depend on applicable law, actual human contributions and third-party rights. Attribution or adoption alone does not establish copyright in an output. Review states are recorded separately on the versions page.
Third-party image register
The 20 existing images retain sources and fingerprints. Their licences remain subject to verification; they are neither assigned wholesale to the primary author nor given new reuse permissions.
| File | Source | Rights status |
|---|---|---|
assets/images/01-01.img | www.quien.net | Original rights retained · licence unverified |
assets/images/02-01.img | snl.no | Original rights retained · licence unverified |
assets/images/03-01.img | site.unibo.it | Original rights retained · licence unverified |
assets/images/04-01.img | www.futura-sciences.com | Original rights retained · licence unverified |
assets/images/05-01.img | snl.no | Original rights retained · licence unverified |
assets/images/06-01.img | valeman.medium.com | Original rights retained · licence unverified |
assets/images/07-01.img | commons.wikimedia.org | Original rights retained · licence unverified |
assets/images/08-01.img | masterymind.co.uk · web.mit.edu · www.heurema.com · www.iitianacademy.com · www.academia.edu · www.slideserve.com · www.mvp.cufo.cz | Original rights retained · licence unverified |
assets/images/08-02.img | masterymind.co.uk · web.mit.edu · www.heurema.com · www.iitianacademy.com · www.academia.edu · www.slideserve.com · www.mvp.cufo.cz | Original rights retained · licence unverified |
assets/images/08-03.img | masterymind.co.uk · web.mit.edu · www.heurema.com · www.iitianacademy.com · www.academia.edu · www.slideserve.com · www.mvp.cufo.cz | Original rights retained · licence unverified |
assets/images/08-04.img | masterymind.co.uk · web.mit.edu · www.heurema.com · www.iitianacademy.com · www.academia.edu · www.slideserve.com · www.mvp.cufo.cz | Original rights retained · licence unverified |
assets/images/08-05.img | masterymind.co.uk · web.mit.edu · www.heurema.com · www.iitianacademy.com · www.academia.edu · www.slideserve.com · www.mvp.cufo.cz | Original rights retained · licence unverified |
assets/images/08-06.img | masterymind.co.uk · web.mit.edu · www.heurema.com · www.iitianacademy.com · www.academia.edu · www.slideserve.com · www.mvp.cufo.cz | Original rights retained · licence unverified |
assets/images/08-07.img | masterymind.co.uk · web.mit.edu · www.heurema.com · www.iitianacademy.com · www.academia.edu · www.slideserve.com · www.mvp.cufo.cz | Original rights retained · licence unverified |
assets/images/09-01.img | prints.royalsociety.org | Original rights retained · licence unverified |
assets/images/10-01.img | www.meisterdrucke.com | Original rights retained · licence unverified |
assets/images/11-01.img | www.meisterdrucke.it | Original rights retained · licence unverified |
assets/images/12-01.img | www.sothebys.com | Original rights retained · licence unverified |
assets/images/13-01.img | dun.unistra.fr | Original rights retained · licence unverified |
assets/images/14-01.img | www.talmudology.com | Original rights retained · licence unverified |
Complete material register and SHA-256 · LICENSE.md · markdown-it licence · MathJax licence · Beautiful Soup licence · Soup Sieve licence
Policy references and privacy
For a jurisdiction-specific reference on AI and human contributions, see the US Copyright Office’s 2025 summary; it is not presented as a universal legal conclusion. GitHub explains the relation between public repositories and licensing. Private writing records, prompts, private review correspondence and unpublished research are excluded from public downloads.