# Elementary Number Theory and Elliptic Curves

**This is the newest version (September 2004):**

**This is the version rom May 2003:**

This older version contains some chapters (on quadratic forms,
elliptic curves, and certain computer algebra systems) that I cut from
the September 2004 version above, so it might still be of
interest to you. Also see this
remark about optimizing use of Mathematica by a reader.
**This is the original version of the text that was used in the course: **