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A person reads every message. Tell us the lesson and the step, and we can usually fix a mistake the same week.

A step looks wrong

Send the lesson address and the line you are looking at. Every step comes from a computer algebra system applying one named rule, so a wrong one is a bug we can find and fix.

Something is missing

Name the topic you wanted and could not find. Requests are how the curriculum grows, and a topic asked for twice usually gets written.

Sources and licensing

Lessons built from open textbooks name the book and its licence at the foot of the page. Write to us about attribution, reuse, or a source you think we have credited wrongly.

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