Privacy

Analytics

I use Google Analytics, loaded with Google's tag and Google Tag Manager, to see which pages people read and roughly where they arrive from — so I know whether anyone finds this useful, and what to write more of. It records things like the pages you visit, your approximate location (country or city, not your address), your device and browser type, and the site that linked you here. Google Analytics 4 does not store IP addresses.

It also counts clicks on papers: which paper's page was opened, and whether its PDF, HTML version or arXiv page was followed. Only the arXiv number and the kind of link are sent with that count.

If you're visiting from the European Economic Area, the UK or Switzerland, where this kind of measurement needs your consent and I don't show a cookie banner, Analytics cookies are off by default. Google may still receive anonymous, cookie-free signals that a page was viewed.

You can opt out entirely with Google's Analytics opt-out add-on, or with your browser's tracking protection or a content blocker — the site works exactly the same either way. Google's own terms are in its explanation of how it uses data from sites like this one.

Hosting

The site is served by Cloudflare, which, like any web host, processes your IP address to deliver pages and to protect the site from abuse.

Fonts and links

The fonts are served from this site, so reading a page doesn't contact a font service. Links to arXiv, YouTube, university pages and journals go to those sites, which have their own policies.

What stays in your browser

A few preferences are kept in your browser's local storage and never sent anywhere: the light or dark theme you choose, the papers you save to your reading list, the authors you follow and which of their papers you have seen, the milestones you tick in the Guidebook, and in the guidebook your reading settings, where you stopped reading and which chapters you have finished. Clearing your browser's site data removes them.

If you write to me

If you email me, I use your message and address only to reply. I don't add you to anything, and I don't share it. If you ask for an NP ID or a change to an author page, only the name and links you ask to show are published.

Questions

Write to me and I'll answer.

Last updated Nov 3, 2026.