Fanography

This is the repository for fanography.info, a tool to visually study the geography of Fano 3-folds.

It is a static Hugo site. Everything is computed from the data files at build time — there is no server and no build script to run.

Structure

• data/ — the source of truth, hand-editable YAML:
  • data.yml — the 105 Fano 3-folds (the main data); facts that cannot be derived from the classification (very-ample/hyperelliptic/trigonal, quantum cohomology, …) are inlined per entry, transcribed once from the old Flask app
  • sections.yml — zero-section descriptions
  • delpezzo_surfaces.yml, delpezzo_varieties.yml — del Pezzo data
• layouts/ — the Hugo templates. layouts/partials/lib/enrich-fano.html derives every computed invariant (genus, blowup graph, K-stability, polyvector, …) from data.yml; layouts/partials/components/ are the presentation partials.
• content/ — page stubs; the per-Fano (/2-22) and per-rank (/2) pages are generated by content/_content.gotmpl.
• static/ — CSS, favicon and the CNAME.

Math is rendered client-side with KaTeX; styling uses Bootstrap 5.

Building

Install Hugo extended (≥ 0.146), then:

hugo server      # local preview at http://localhost:1313
hugo --gc --minify   # production build into public/

To edit the data, change the YAML in data/ and rebuild — all pages update.

Deployment

Pushing to master builds the site and deploys it to GitHub Pages via .github/workflows/hugo.yml (custom domain set through static/CNAME).

How to cite

The website is archived on Zenodo. To cite the version-independent latest release, use the concept DOI 10.5281/zenodo.21296718.

@online{fanography,
  author = {Belmans, Pieter},
  title  = {Fanography},
  url    = {https://fanography.info},
  doi    = {10.5281/zenodo.21296718},
  year   = {2026},
}