# Syllogism

A syllogism (Greek: συλλογισμός – syllogismos – "conclusion," "inference") is a kind of logical argument in which one proposition (the conclusion) is inferred from two or more others (the premises) of a specific form. In antiquity, two rival theories of the syllogism existed: Aristotelian syllogistic and Stoic syllogistic.

Aristotle defines the syllogism as "a discourse in which certain (specific) things having been supposed, something different from the things supposed results of necessity because these things are so."

Despite this very general definition, in the Prior Analytics Aristotle limits himself to categorical syllogisms, which consist of three categorical propositions. These included categorical modal syllogisms. From the Middle Ages onwards, "categorical syllogism" and "syllogism" were mostly used interchangeably, and the present article is concerned with this traditional use of "syllogism" only. The syllogism was at the core of traditional deductive reasoning, where facts are determined by combining existing statements, in contrast to inductive reasoning where facts are determined by repeated observations.

The syllogism was superseded by first-order predicate logic following the work of Gottlob Frege, in particular his Begriffsschrift (Concept Script) (1879), but syllogisms remain useful.

Read more about Syllogism:  Basic Structure, Types of Syllogism, Terms in Syllogism, Existential Import, Syllogism in The History of Logic, Syllogistic Fallacies

### Other articles related to "syllogism":

Syllogism - Syllogistic Fallacies
... This is because first, the mood of the syllogism invoked is illicit (III), and second, the supposition of the middle term is variable between that of the middle term in the major premise, and that of ... Determining the validity of a syllogism involves determining the distribution of each term in each statement, meaning whether all members of that term are accounted for ... it does not affect the form of the syllogism ...
Statistical Syllogism
... A statistical syllogism (or proportional syllogism or direct inference) is a non-deductive syllogism ...
Politician's Syllogism
... The politician's syllogism, also known as the politician's logic or the politician's fallacy, is a logical fallacy of the form We must do something This is something Therefore, we must do this ... The syllogism, invented by fictional British civil servants, has been quoted in the real British Parliament ... The syllogism has also been quoted in American political discussion ...
Bryson Of Heraclea - Life and Work - Robert Kilwardby On Bryson's Syllogism
... described Bryson's attempt of proving the quadrature of the circle as a sophistical syllogism---one which "deceives in virtue of the fact that it promises to yield a conclusion ... This syllogism is sophistical not because the consequence is false, and not because it produces a syllogism on the basis of apparently readily believable ...