def epsilon(i, j, k):
    if (i, j, k) in [(1, 2, 3), (2, 3, 1), (3, 1, 2)]:
        return 1
    elif (i, j, k) in [(1, 3, 2), (3, 2, 1), (2, 1, 3)]:
        return -1
    else:
        return 0
Factory method for a member representing all authenticated users.
dataset/ETHPy150Open sympy/sympy/sympy/physics/paulialgebra.py/epsilon--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/gcloud-python/gcloud/pubsub/iam.py/Policy.authenticated_users