## A little intro to the Jacobi symbol: Part 2

In the last post, we examined the Jacobi symbol: for two relatively prime integers $m$ and $n$, we defined the Jacobi symbol $(m/n)$ to be the sign of the permutation $x\mapsto mx$ on the ring $\Z/n$. It turns out that the Jacobi symbol plays a part in the theory of quadratic residues. For a number […]