Combining Philosophers

Ideas for Sextus Empiricus, R Keefe / P Smith and Stoic school

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5 ideas

5. Theory of Logic / B. Logical Consequence / 8. Material Implication

12196

A valid hypothetical syllogism is 'that which does not begin with a truth and end with a falsehood' [Sext.Empiricus]

5. Theory of Logic / E. Structures of Logic / 1. Logical Form

21400

Stoics avoided universals by paraphrasing 'Man is...' as 'If something is a man, then it is...' [Stoic school, by Long]

6020	'Man is a rational mortal animal' is equivalent to 'if something is a man, that thing is a rational mortal animal' [Sext.Empiricus]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not

20788

The contradictory of a contradictory is an affirmation [Stoic school, by Diog. Laertius]

5. Theory of Logic / L. Paradox / 7. Paradoxes of Time

1902	Since Socrates either died when he was alive (a contradiction) or died when he was dead (meaningless), he didn't die [Sext.Empiricus]