Philosophy Lexicon of Arguments

Author Item Excerpt Meta data

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IV 21
Impossible world/Impo.wo./LewisVs: does not exist. - Problem: describe the impossible things in it. - 1) consistent truths about them. - 2) false contradictions about them. - a) truth about pigs that can fly and cannot. - b) contradictory falsehood that they can fly there, although it is not so that they can fly there. - Lewis: such a distinction cannot be made. - VsLewis: at best one could argue with something like "truth in fiction". - LewisVs: but that does not help.
V 15
Impossible world/Impo.wo./Lewis: If we cannot find a most similar possible world among the similar possible worlds - (e.g. 7 foot + e for shrinking e finds no limit) - then we can still assume impossible worlds - S be any maximum number of sentences, so that for every finite conjunction of C sentences in S wA>>wC is applicable in i - S is then a complete description of a - possible or impossible - way of how the facts could be if A was the case (seen from the position of i) - then we must postulate an impossible world where all sentences from S apply - it should be accessible from i alone (!) - it should be closer to i than every possible world - Important argument: but not closer to i than any possible world which in turn is closer than all possible A-worlds - impossible worlds here accessibility and comparable similarity are undefined. - The limiting assumption is obviously fulfilled. - The sentences in an impossible world may be incompatible. - But you cannot derive any contradiction from them - because there may be consistency subsets. - E.g. I am more than 7 feet tall - our borderline worlds will be impossible worlds where A is true, but where ..7.1 foot .. ..7.01, .. 7.001, etc. is wrong. - Important argument: this is not the same as the possible world where I am infinitesimally more than 7 feet tall: because there are such worlds, where physical quantities can take non-standard values, which ​​in turn differ infinitesimally from their natural numbers - Numbers/Measuring/Physics: e.g. physical quantities are never non-standard values.
V 16
That is false in any possible world where I am infinitessimally larger than 7 feet, but true in the impossible closest A worlds. - LewisVs: it is bad to assume such a thing, but it can be reduced to less problematic sets of propositions or sentences.
V 18
Impossible frontier worlds: here, impossible, but consistent endless combinations of possible true propositions become true.
V 15
Impossible world/Lewis: is assumed if infinitesimal approach does not deliver a definitely last most similar possible worlds - Vs: we should assume sets of propositions or sentences instead of impossible worlds.

D. Lewis
Die Identität von Körper und Geist Frankfurt 1989

D. Lewis
Konventionen Berlin 1975

D. Lewis
Philosophical Papers Bd I New York Oxford 1983

D. Lewis
Philosophical Papers Bd II New York Oxford 1986

LwCl I
Cl. I. Lewis
Mind and the World Order: Outline of a Theory of Knowledge (Dover Books on Western Philosophy) 1991

> Counter arguments against Lewis
> Counter arguments in relation to Impossible World

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Ed. Martin Schulz, access date 2017-05-29