Philosophy Lexicon of Arguments

Modal logic: the modal logic is an extension of classical logic to systems in which possibility and necessity can also be expressed. Different approaches use operators to express "necessary" and "possible", which, depending on the placement within formulas, can let claims of different strengths win. E.g. there is an object which necessarily has the property F/it is necessary that there is an object with the property F. The introduction of possible worlds makes quantification possible for expressing possibility (There is at least one world in which ...) and necessity (For all worlds is valid ...). See also operators, quantifier, completion, range, possible worlds.
Author Item Excerpt Meta data

Books on Amazon
IV 10
Modal logic/Lewis: can be replaced by non-modal reasoning about possible objects - with non-modal arguments we have clear validity conditions.
V 11
Modal logic/tradition/Lewis: the traditional modal logic knows no accessibility relation - i.e. all possible worlds are always accessible from everywhere.

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

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> Counter arguments in relation to Modal Logic

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Ed. Martin Schulz, access date 2017-05-25