Mistakes and changes

This is written carefully, but it is offered without any warranty that it is complete, up to date, or correct in every detail. Subjects like this move, and a page can fall behind what it describes.

Where links lead

Pages elsewhere are revised on their owners' schedules, not this one's. What a link pointed to when it was added may not be what it points to today.

Revisions

If any of this changes, the updated version supersedes the previous one once it is on this page.

If something here is wrong

For anything to do with a point covered on these pages, write to [email protected].