Ideas from 'Conditionals' by Frank Jackson [2006], by Theme Structure
[found in 'Blackwell Guide to Philosophy of Language' (ed/tr Devitt,M/Hanley,R) [Blackwell 2006,0631231420]].
Click on the Idea Number for the full details 
back to texts

expand these ideas
5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
14352

'¬', '&', and 'v' are truth functions: the truth of the compound is fixed by the truth of the components

10. Modality / B. Possibility / 8. Conditionals / b. Types of conditional
14360

Possible worlds for subjunctives (and dispositions), and notruth for indicatives?

10. Modality / B. Possibility / 8. Conditionals / c. Truthfunction conditionals
14354

When A and B have the same truth value, A→B is true, because A→A is a logical truth

14355

(A&B)→A is a logical truth, even if antecedent false and consequent true, so it is T if A is F and B is T

14353

Modus ponens requires that A→B is F when A is T and B is F

10. Modality / B. Possibility / 8. Conditionals / d. Nontruthfunction conditionals
14357

Possible worlds account, unlike A⊃B, says nothing about when A is false

14358

In the possible worlds account of conditionals, modus ponens and modus tollens are validated

14359

Only assertions have truthvalues, and conditionals are not proper assertions

10. Modality / B. Possibility / 8. Conditionals / f. Pragmatics of conditionals
14356

We can't insist that A is relevant to B, as conditionals can express lack of relevance
