@classmethod
def trivial(cls):
    """
        Return a trivial LCA.

        Returns
        --------
        group : LCA
            A trivial LCA.

        Examples
        ---------
        >>> trivial = LCA.trivial()
        >>> Z = LCA([0])
        >>> (Z + trivial).isomorphic(Z)
        True
        """
    return cls(orders=[1], discrete=[True])
