User:Marty/UCSC Math 110 Fall 2008/Week 8

This week, we are beginning our study of quadratic residues.

This includes:
 * Quadratic residues, the Legendre symbol, Euler's criterion, and the fact that half of the nonzero residues are quadratic residues.

We are building up to a proof of quadratic reciprocity, following Zolotarev. This includes:
 * Zolotarev's lemma, and the proof of quadratic reciprocity!