Combining Philosophers

Ideas for B Hale / C Wright, Rom Harr and John Richardson

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4. Formal Logic / A. Syllogistic Logic / 2. Syllogistic Logic

15879	The Square of Opposition has two contradictory pairs, one contrary pair, and one sub-contrary pair [Harré]
	Full Idea: Square of Opposition: 'all A are B' and 'no A are B' are contraries; 'some A are B' and 'some A are not B' are sub-contraries; the pairs 'all A are B'/'some A are B' and 'no A are B'/'some A are B' are contradictories.
	From: Rom Harré (Laws of Nature [1993], 3)
	A reaction: [the reader may construct his own diagram from this description!] The contraries are at the extremes of contradiction, but the sub-contraries are actual compatible. You could add possible worlds to this picture.