# Math Help - use quadratic reciprocity to prove...

1. ## use quadratic reciprocity to prove...

Use our version of quadratic reciprocity to prove Euler's version, which is that (for p, q odd primes) (-1)^((p-1)/2)p is a quadratic residue modulo q if and only if q is a quadratic residue modulo p.

2. Originally Posted by NikoBellic
Use our version of quadratic reciprocity to prove Euler's version, which is that (for p, q odd primes) (-1)^((p-1)/2)p is a quadratic residue modulo q if and only if q is a quadratic residue modulo p.
What is 'our' version?

3. I think it's just the standard version.