Combining Texts

All the ideas for 'General Facts,Phys Necessity, and Metaph of Time', 'The Problem of Counterfactual Conditionals' and 'The Laws of Thought'

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6 ideas

3. Truth / B. Truthmakers / 3. Truthmaker Maximalism

17962

The truth-maker principle is that every truth has a sufficient truth-maker [Forrest]

4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic

8083	Boole applied normal algebra to logic, aiming at an algebra of thought [Boole, by Devlin]

7727	Boole's notation can represent syllogisms and propositional arguments, but not both at once [Boole, by Weiner]

5. Theory of Logic / A. Overview of Logic / 2. History of Logic

8686	Boole made logic more mathematical, with algebra, quantifiers and probability [Boole, by Friend]

5. Theory of Logic / H. Proof Systems / 2. Axiomatic Proof

22277

Boole's method was axiomatic, achieving economy, plus multiple interpretations [Boole, by Potter]

10. Modality / B. Possibility / 9. Counterfactuals

12191

Counterfactuals are true if logical or natural laws imply the consequence [Goodman, by McFetridge]