Contact

Email: discretefree@gmail.com

Reporting an error

Every question shows an ID under its explanation (for example, bb1). Include in your email:

• The question ID or page link
• What you think is wrong
• A source, if you have one (textbook, chapter, or article)

Corrections are reviewed and the question's review date is updated once it is fixed.

Other messages

Suggestions for topics, feedback on the site, and privacy requests go to the same address.