This combined edition of the CLP differential calculus text is still undergoing testing and changes. Because of this we request that if you find a problem or error in the text then:

1. Please check the errata list that can be found at the text webpage.
2. Is the problem in the online version or the PDF version or both?
3. Note the URL of the online version and the page number in the PDF
4. Send an email to clp@ugrad.math.ubc.ca. Please be sure to include

• a description of the error
• the URL of the page, if found in the online edition
• and if the problem also exists in the PDF, then the page number in the PDF and the compile date on the front page of PDF.