Dictum de omni et nullo

In Aristotelian 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.^[1]

^ John Stuart Mill (15 January 2001). System of Logic Ratiocinative and Inductive: Being a Connected View of the Principles of Evidence and the Methods of Scientific Investigation. Elibron.com. p. 114. ISBN 978-1-4021-8157-3. Retrieved 6 March 2011.

[Mill2001-1] John Stuart Mill (15 January 2001). System of Logic Ratiocinative and Inductive: Being a Connected View of the Principles of Evidence and the Methods of Scientific Investigation. Elibron.com. p. 114. ISBN 978-1-4021-8157-3. Retrieved 6 March 2011.

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