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.
A person reads every message. Tell us the lesson and the step, and we can usually fix a mistake the same week.
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.
Name the topic you wanted and could not find. Requests are how the curriculum grows, and a topic asked for twice usually gets written.
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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