Charles S. Peirce Studies(27th April, 2005): Web site devoted to the life and works of C. S. Peirce.
Syllogistic logic online(27th April, 2005): 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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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.