Combining Texts

All the ideas for 'Contextualist Solutions to Scepticism', 'Putnam's Paradox' and 'Symbolic Logic (with Langford)'

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8 ideas

5. Theory of Logic / J. Model Theory in Logic / 2. Isomorphisms

14212	A consistent theory just needs one model; isomorphic versions will do too, and large domains provide those [Lewis]
	Full Idea: A consistent theory is, by definition, one satisfied by some model; an isomorphic image of a model satisfies the same theories as the original model; to provide the making of an isomorphic image of any given model, a domain need only be large enough.
	From: David Lewis (Putnam's Paradox [1984], 'Why Model')
	A reaction: This is laying out the ground for Putnam's model theory argument in favour of anti-realism. If you are chasing the one true model of reality, then formal model theory doesn't seem to offer much encouragement.

7. Existence / D. Theories of Reality / 4. Anti-realism

14213	Anti-realists see the world as imaginary, or lacking joints, or beyond reference, or beyond truth [Lewis]
	Full Idea: Anti-realists say the only world is imaginary, or only has the parts or classes or relations we divide it into, or doubt that reference to the world is possible, or doubt that our interpretations can achieve truth.
	From: David Lewis (Putnam's Paradox [1984], 'Why Anti-R')
	A reaction: [compression of a paragraph on anti-realism] Lewis is a thoroughgoing realist. A nice example of the rhetorical device of ridiculing an opponent by suggesting that they don't even know what they themselves believe.

9. Objects / C. Structure of Objects / 8. Parts of Objects / b. Sums of parts

14210	A gerrymandered mereological sum can be a mess, but still have natural joints [Lewis]
	Full Idea: The mereological sum of the coffee in my cup, the ink in this sentence, a nearby sparrow, and my left shoe is a miscellaneous mess of an object, yet its boundaries are by no means unrelated to the joints of nature.
	From: David Lewis (Putnam's Paradox [1984], 'What Might')
	A reaction: In that case they do, but if there are no atoms at the root of physics then presumably their could also be thoroughly jointless assemblages, involving probability distributions etc. Even random scattered atoms seem rather short of joints.

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

7803	Modal logic began with translation difficulties for 'If...then' [Lewis,CI, by Girle]
	Full Idea: C.I.Lewis began his groundbreaking work in modal logic because he was concerned about the unreliability of the material conditional as a translation of 'If ... then' conditionals.
	From: report of C.I. Lewis (Symbolic Logic (with Langford) [1932]) by Rod Girle - Modal Logics and Philosophy 12.3
	A reaction: Compare 'if this is square then it has four corners' with 'if it rains then our afternoon is ruined'. Different modalities seem to be involved. We even find that 'a square has four corners' will be materially implied if it rains!

13. Knowledge Criteria / C. External Justification / 6. Contextual Justification / a. Contextualism

19508	Contextualism needs a semantics for knowledge sentences that are partly indexical [Schiffer,S]
	Full Idea: Contextualist semantics must capture the 'indexical' nature of knowledge claims, the fact that different utterances of a knowledge sentence with no apparent indexical terms can express different propositions.
	From: Stephen Schiffer (Contextualist Solutions to Scepticism [1996], p.325), quoted by Keith DeRose - The Case for Contextualism 1.5
	A reaction: Schiffer tries to show that this is too difficult, and DeRose defends contextualism against the charge.

19509	The indexical aspect of contextual knowledge might be hidden, or it might be in what 'know' means [Schiffer,S]
	Full Idea: One might have a 'hidden-indexical' theory of knowledge sentences: they contain constituents that are not the semantic values of any terms; ...or 'to know' itself might be indexical, as in 'I know[easy] I have hands' or 'I know[tough] I have hands'.
	From: Stephen Schiffer (Contextualist Solutions to Scepticism [1996], p.326-7), quoted by Keith DeRose - The Case for Contextualism 1.5
	A reaction: [very compressed] Given the choice, I would have thought it was in 'know', since to say 'either you know p or you don't' sounds silly to me.

19. Language / B. Reference / 3. Direct Reference / b. Causal reference

14215	Causal theories of reference make errors in reference easy [Lewis]
	Full Idea: Whatever happens in special cases, causal theories usually make it easy to be wrong about the thing we refer to.
	From: David Lewis (Putnam's Paradox [1984], 'What Is')
	A reaction: I suppose the point of this is that there are no checks and balances to keep reference in focus, but just a requirement to keep connected to an increasingly attenuated causal chain.

19. Language / B. Reference / 4. Descriptive Reference / b. Reference by description

14209	Descriptive theories remain part of the theory of reference (with seven mild modifications) [Lewis]
	Full Idea: Description theories of reference are supposed to have been well and truly refuted. I think not: ..it is still tenable with my seven points, and part of the truth of reference [7: rigidity, egocentric, tokens, causal, imperfect, indeterminate, families].
	From: David Lewis (Putnam's Paradox [1984], 'Glob Desc')
	A reaction: (The bit at the end refers to his seven points, on p.59). He calls his basic proposal 'causal descriptivism', incorporating his seven slight modifications of traditional descriptivism about reference.