This is the first year that we are using a new texbook specially written for this course by the Stanford Math department in consultation with colleagues in many other departments The book is free and available in electronic version only. Please click on this link to download the book using any valid SUNet ID.

In this first year using the new book, we will regularly update the textbook link to fix typos. (We have done a lot of proofreading, but inevitably some typos will have slipped through.) Please plan to download the book at least every Wednesday and don't print more than you'd need for a few days at a time (it's also fine to never print any of it).

The book contains much more than is covered in the course. It also includes many fully worked examples, helpful for studying (akin to "odd-numbered exercises with solutions in the back"). We hope it will be a useful resource for topics that you encounter in later coursework, and we appreciate any feedback. Please send any comments, typos etc. to math51book@lists.stanford.edu.

Spring 2019
Department of Mathematics, Stanford University
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