Combining Philosophers

Ideas for Plotinus, Horsten,L/Pettigrew,R and Rod Girle

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5 ideas

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

18739

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

5. Theory of Logic / B. Logical Consequence / 7. Strict Implication

7789	Necessary implication is called 'strict implication'; if successful, it is called 'entailment' [Girle]

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

18741

Logical formalization makes concepts precise, and also shows their interrelation [Horsten/Pettigrew]

5. Theory of Logic / H. Proof Systems / 5. Tableau Proof

7790	If an argument is invalid, a truth tree will indicate a counter-example [Girle]

5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models

18744

Models are sets with functions and relations, and truth built up from the components [Horsten/Pettigrew]