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7 ideas

5. Theory of Logic / A. Overview of Logic / 6. Classical Logic

4705	Logical relativism appears if we allow more than one legitimate logical system [O'Grady]

5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence

4700	A third value for truth might be "indeterminate", or a point on a scale between 'true' and 'false' [O'Grady]

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

4730	For Aristotle, the subject-predicate structure of Greek reflected a substance-accident structure of reality [Aristotle, by O'Grady]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

4704	Wittgenstein reduced Russell's five primitive logical symbols to a mere one [O'Grady]

5. Theory of Logic / L. Paradox / 1. Paradox

6007	If you know your father, but don't recognise your father veiled, you know and don't know the same person [Eubulides, by Dancy,R]

5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / a. The Liar paradox

6006	If you say truly that you are lying, you are lying [Eubulides, by Dancy,R]

5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / b. The Heap paradox ('Sorites')

6008	Removing one grain doesn't destroy a heap, so a heap can't be destroyed [Eubulides, by Dancy,R]