In this page you can find a free version of my book “Number Theory and Geometry” which was published by the American Mathematical Society in 2019, as part of their Pure and Applied Undergraduate Mathematics Texts Series.

Some notes:

- I would like to thank the AMS for allowing me to post a free version of the book here.
- Please note that the version posted here is not equivalent to the published version. The AMS put many hours into polishing and editing the manuscript before printing, so please consider supporting the AMS publishing by purchasing their books! The official page for the book is here: https://bookstore.ams.org/amstext-35
- I keep a page with updates/comments/errata (which will hopefully be incorporated in a later version/edition of the book). Thanks to all who have contacted me with comments!

Here is the free version! Enjoy:

**NUMBER THEORY AND GEOMETRY, by Álvaro Lozano-Robledo.**