Let $p$ be an odd prime.
Let $a \in \Z$ be an integer such that $a \not \equiv 0 \pmod p$.
Then $a$ is a quadratic residue of $p$ if and only if $x^2 \equiv a \pmod p$ has a solution.
That is, if and only if:
- $\exists x \in \Z: x^2 \equiv a \pmod p$
This category has the following 4 subcategories, out of 4 total.
Pages in category "Quadratic Residues"
The following 4 pages are in this category, out of 4 total.