Welcome to Math 21a! There is a mandatory introductory course meeting on Monday, January 23 at 8:30 am in Science Center C.

Math 21a is taught entirely in sections; to join the course, you must

**section by 4 pm on Monday, January 23**. Instructions for sectioning can be found here.If you're not sure whether Math 21a is the right course for you, we strongly encourage you to speak with a math placement advisor.

The textbook we will use is

*Multivariable Calculus: Concepts and Contexts*by James Stewart.You may use either the 3rd edition or 4th edition. (You can also use the version called just

*Calculus: Concepts and Contexts*, which should include both single- and multi-variable calculus; just be careful not to buy a book that only has the single variable part.) There are copies on reserve in Cabot Library.