Combining Texts

All the ideas for 'Two Problems of Epistemology', 'Elements of Law and Justice' and 'On Assertion and Indicative Conditionals'

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4 ideas

10. Modality / B. Possibility / 8. Conditionals / c. Truth-function conditionals

14288	'If A,B' affirms that A⊃B, and also that this wouldn't change if A were certain [Jackson, by Edgington]
	Full Idea: According to Jackson, in asserting 'If A,B' the speaker expresses his belief that A⊃B, and also indicates that this belief is 'robust' with respect to the antecedent A - the speaker would not abandon A⊃B if he were to learn that A.
	From: report of Frank Jackson (On Assertion and Indicative Conditionals [1979]) by Dorothy Edgington - Conditionals (Stanf) 4.2
	A reaction: The point is that you must not believe A⊃B solely on the dubious grounds of ¬A. This is 'to ensure an assertable conditional is fit for modus ponens' - that is, that you really will affirm B when you learn that A is true. Nice idea.

13769	Conditionals are truth-functional, but should only be asserted when they are confident [Jackson, by Edgington]
	Full Idea: Jackson holds that conditionals are truth-functional, but are governed by rules of assertability, rather like 'but' compared to 'and'. The belief must be 'robust' - the speaker would not abandon his belief that A⊃B if he were to learn that A.
	From: report of Frank Jackson (On Assertion and Indicative Conditionals [1979]) by Dorothy Edgington - Conditionals 17.3.2
	A reaction: This seems to spell out more precisely the pragmatic approach to conditionals pioneered by Grice, in Idea 13767. The idea is make conditionals 'fit for modus ponens'. They mustn't just be based on a belief that ¬A.

14. Science / A. Basis of Science / 6. Falsification

18284	Particulars can be verified or falsified, but general statements can only be falsified (conclusively) [Popper]
	Full Idea: Whereas particular reality statements are in principle completely verifiable or falsifiable, things are different for general reality statements: they can indeed be conclusively falsified, they can acquire a negative truth value, but not a positive one.
	From: Karl Popper (Two Problems of Epistemology [1932], p.256), quoted by J. Alberto Coffa - The Semantic Tradition from Kant to Carnap 18 'Laws'
	A reaction: This sounds like a logician's approach to science, but I prefer to look at coherence, where very little is actually conclusive, and one tinkers with the theory instead.

14. Science / C. Induction / 2. Aims of Induction

19387	Hypotheses come from induction, which is comparison of experiences [Leibniz]
	Full Idea: We construct a hypothesis on the basis of an induction, that is on the basis of a comparison of experiences.
	From: Gottfried Leibniz (Elements of Law and Justice [1669], p.2)
	A reaction: This fits the traditional positivist picture of science (observe-hypothesise-predict-observe). I like the definition of induction as 'comparison of experiences', because it doesn't reduce it to sequences of objects, and points to coherence.