def inversion_indices(df1, df2, column):
    """Return the indices in which df1[column] > df2[column]
    :param df1: A data frame
    :param df2: Another data frame
    :param column: A shared column
    :return: The indices where df1[column] > df2[column]
    """
    return df1[df1[column] > df2[column]].index