Directory:Logic Museum/The Square of Opposition

THE SQUARE OF OPPOSITION

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Apuleius' square

A collection of source material on the famous Square of Opposition. The diagram above is from a ninth century manuscript of Apuleius' commentary on Aristotle's Perihermaneias, probably one of the oldest surviving pictures of the square.

• Apuleius' Commentary on the Perihermenias
  
• Boethius' translation of the Perihermenias with Edghill's English translation
  
• Boethius' Perihermenias Parallel translation Edward Buckner's English translation of chapters 6 and 7
  
• Natalis on Equipollence
  
• Is 'every man is an animal' true when no man exists?
  
• Brentano's Logical Innovations
  

External links
Internet Encyclopedia entry (This is OK)
Wikipedia April 2007 entry (I wrote part of this).
Parsons' SEP entry (I shall be discussing Parson's view at Montreux).
Logic/Chapter 2.doc Chapter 2 of Parson's book on medieval logic, which covers similar ground.
Old directions in free logic, by Gyula Klima
Montreux International Congress on the Square.

Edward Buckner
London, May 2007