import numpy as np
from typing import cast, List

def null( A: np.ndarray ) -> np.ndarray:
    A = np.atleast_2d(A)
    u, s, vh = np.linalg.svd(A)
    tol = max(1e-13, 0)
    nnz = (s >= tol).sum()
    return cast( np.ndarray, vh[nnz:].conj() )