Combining Philosophers

Ideas for Democritus, Horsten,L/Pettigrew,R and Jennifer Fisher

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

8951	Classical logic is: excluded middle, non-contradiction, contradictions imply all, disjunctive syllogism [Fisher]

5. Theory of Logic / A. Overview of Logic / 9. Philosophical Logic

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Three stages of philosophical logic: syntactic (1905-55), possible worlds (1963-85), widening (1990-) [Horsten/Pettigrew]