# Polygen and polygens

The `polygens`

function allows to inject variables for constructing multivariate polynomials, as in:

```
sage: x, y = polygens(QQ, 'x, y')
sage: type(x)
<type'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular'>
```

And then an object like `f = x^2*y^2 - 1`

will also be a multivariate polynomial. But if we do instead:

```
sage: x = polygens(QQ, 'x')
sage: type(x)
<type 'tuple'>
```

We get a tuple!? Are there good reasons? I'd rather expect just a `MPolynomial_libsingular`

, or a univariate polynomial, as with:

```
sage: x = polygen(QQ, 'x')
sage: type(x)
<type 'sage.rings.polynomial.polynomial_rational_flint.Polynomial_rational_flint'>
```