|Intensions: intensions are reference objects resulting from a linguistic description, in contrast to the material objects (extensions) that may differ therefrom, whether due to inaccuracies, or by the use of indexical expressions. Examples of intensions are “the oldest person in the room”, “the winner”, “John's favorite quote”, “the one who violates the speed limit”. See also morning star/evening star, extensionality, extension.|
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Frank C. Jackson
|Stalnaker I 16
Definition Propositional concepts/Stalnaker: propositional concepts are functions of possible worlds on truth values. When an utterance in a possible world is associated with a propositional idea, one can define with it two different propositions: A-Intension and C-Intension (Terminology by Jackson).
C: The propositional thought
X: The possible world
U: The utterance
Definition C-Intension/Jackson: is c (x), expressed by u in x. ((s) whereby the semantics in world x causes the content c to be expressed, which may differ from what can be meant in another world). So relative to the possible world.
Definition A-Intension/Jackson: the A-Intension is defined solely by the propositional idea. ((s) that what is meant.) (Independent of possible worlds).
F. C. Jackson
From Metaphysics to Ethics: A Defence of Conceptual Analysis Oxford 2000
Ways a World may be Oxford New York 2003