In Aristotelean logic, dictum de omni et nullo (Latin: "the maxim of all and none") is the principle that whatever is affirmed or denied of a whole kind K may be affirmed or denied (respectively) of any subkind of K. This principle is fundamental to syllogistic logic in the sense that all valid syllogistic argument forms are reducible to applications of the two constituent principles dictum de omni and dictum de nullo.
网络释义
1、别事物一致或相矛盾
凡与一概念普遍的一致或相矛盾者，则亦必与包含于此概念下之一切特 别事物一致或相矛盾（dictum de omni et nullo），此命题固极真实； 但若变更此逻辑的原理而为：凡不包含在普遍的概念中者，亦不包含于在此 概念下之特殊的概念中，则背谬矣。