def dmp_discriminant(f, u, K):
    """
    Computes discriminant of a polynomial in `K[X]`.

    Examples
    ========

    >>> from sympy.polys import ring, ZZ
    >>> R, x,y,z,t = ring("x,y,z,t", ZZ)

    >>> R.dmp_discriminant(x**2*y + x*z + t)
    -4*y*t + z**2

    """
    if not u:
        return dup_discriminant(f, K)

    d, v = dmp_degree(f, u), u - 1

    if d <= 0:
        return dmp_zero(v)
    else:
        s = (-1)**((d*(d - 1)) // 2)
        c = dmp_LC(f, K)

        r = dmp_resultant(f, dmp_diff(f, 1, u, K), u, K)
        c = dmp_mul_ground(c, K(s), v, K)

        return dmp_quo(r, c, v, K)
dataset/ETHPy150Open sympy/sympy/sympy/polys/euclidtools.py/dmp_discriminant/original