Aristotle's logic

The Organon (Greek: Ὄργανον, meaning "instrument, tool, organ") is the standard collection of Aristotle's six works on logic. The name Organon was given by Aristotle's followers, the Peripatetics. They are as follows:

The order of the works is not chronological (which is now hard to determine) but was deliberately chosen by Theophrastus to constitute a well-structured system. Indeed, parts of them seem to be a scheme of a lecture on logic. The arrangement of the works was made by Andronicus of Rhodes around 40 BC.

Aristotle's Metaphysics has some points of overlap with the works making up the Organon but is not traditionally considered part of it; additionally there are works on logic attributed, with varying degrees of plausibility, to Aristotle that were not known to the Peripatetics.

The Organon was used in the school founded by Aristotle at the Lyceum, and some parts of the works seem to be a scheme of a lecture on logic. So much so that after Aristotle's death, his publishers (Andronicus of Rhodes in 50 BC, for example) collected these works.

Following the collapse of the Western Roman Empire in the fifth century, much of Aristotle's work was lost in the Latin West. The Categories and On Interpretation are the only significant logical works that were available in the early Middle Ages. These had been translated into Latin by Boethius. The other logical works were not available in Western Christendom until translated to Latin in the 12th century. However, the original Greek texts had been preserved in the Greek-speaking lands of the Eastern Roman Empire (aka Byzantium). In the mid-twelfth century, James of Venice translated into Latin the Posterior Analytics from Greek manuscripts found in Constantinople.

The books of Aristotle were available in the early Arab Empire, and after 750 AD Muslims had most of them, including the Organon, translated into Arabic, sometimes via earlier Syriac translations. They were studied by Islamic and Jewish scholars, including Rabbi Moses Maimonides (1135–1204) and the Muslim Judge Ibn Rushd, known in the West as Averroes (1126–1198); both were originally from Cordoba, Spain, although the former left Iberia and by 1168 lived in Egypt.

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