Support this library

Everything here is free to read, with no account, no paywall and no advertising, and that will not change. There is no supporter tier, nothing is unlocked by giving, and no part of the library is or will be held back.

What contributions pay for is compute. Every item is read by two independent AI judges from different model families before a human audits it, and a full verification pass over a level of the library is the single largest running cost of the project. Domain registration and the server are the rest of it.

Donation links are not set up yet. In the meantime, the most useful thing you can give is a correction: every item has a Report an issue control, and a real mathematical error found by a reader is worth more than a contribution.

Either way, reporting an error is the contribution that helps most. Every item carries a Report an issue control, and errors get fixed. If you want to know what you would be supporting, the about page describes how the library is written and checked, including what it does not claim.