Aristotle's Reform of Paideia - Article by Evelyn Barker, arguing that the principal aim of Aristotle's Organon was to reform the contemporary paedagogical role of dialectic.
Earliest Uses of Symbols of Set Theory and Logic - Explains the early introduction of notations used in logic and set theory as we know it today. Includes reference links to key people in this area.
Logic - Entry in the Catholic Encyclopaedia (1917), dominated by a historical survey from Indian and Pre-Aristotelian philosophy to the Logic of John Stuart Mill.
Syllogistic logic online - This site contains an online program for studying Aristotle's syllogistic logic. The theory of Aristotle's ancient logic is also presented.
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