Found an error? Report it.

A wrong formula, a bad density figure, a nonsense result, an unclear explanation — all of it matters. Reports are checked by hand and mistakes are fixed at the source. Corrections are published below so you can see what changed.

Report a problem

Prefer email? Write to ianwelkins@gmail.com — the form and email end up in the same place.

Corrections

When a confirmed error is fixed, the correction is listed here with the date, so the site's track record is public.

No corrections have been published yet.