# resultant and gcd over real ?

The resultant and gcd work well over rational but not over real or complex!

```
R.<x,y> = PolynomialRing(RR,2)
a = x^2 + y
b = x - y^2
a.resultant(b)
a.gcd(b)
```

This does not work while with QQ, it works. Anyone has an idea?