Combining Texts

Ideas for 'Meaning and the Moral Sciences', 'Modal Logic within Counterfactual Logic' and 'Intuitionism: an Introduction'

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4 ideas

10. Modality / A. Necessity / 1. Types of Modality

14625

Necessity is counterfactually implied by its negation; possibility does not counterfactually imply its negation [Williamson]

10. Modality / B. Possibility / 8. Conditionals / a. Conditionals

14623

Strict conditionals imply counterfactual conditionals: □(A⊃B)⊃(A□→B) [Williamson]

10. Modality / B. Possibility / 9. Counterfactuals

14624

Counterfactual conditionals transmit possibility: (A□→B)⊃(◊A⊃◊B) [Williamson]

10. Modality / C. Sources of Modality / 1. Sources of Necessity

14531

Rather than define counterfactuals using necessity, maybe necessity is a special case of counterfactuals [Williamson, by Hale/Hoffmann,A]