Among them c . alchourronn p . gardenfors and d . makinson ' s agm theory is the most well known . the agm postulates claimed to be satisfied by any rational revision method . this paper studies several revision methods and puts forward a non - revision method 在所有的方法中最有影响的一个，是由c . alchourron 、 p . gardenfors和d . makinson所提出的agm理论， agm理论中提出了一组应为所有合理的信念修正模型所满足的公设，即所谓的agm公设。
