Philosophy Lexicon of Arguments

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Opacity, philosophy: also opacity of the reference. A problem with propositions (meanings of uttered sentences related to a speaker) is that one cannot be certain that one knows what an utterance refers to. E.g. in an empty room is a blackboard with the inscription "I am hungry". See also intensions, propositions, propositional attitudes, reference, inscrutability, quotation.
 
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Stuhlmann II 57ff ~
opaque contexts / prop. attitude / Frege / Stuhlmann: when the believer connects the same information with two different names for the same person (in particular the identity of the person) then the sentences the same truth value (after substitution).

F I
G. Frege
Die Grundlagen der Arithmetik Stuttgart 1987

F II
G. Frege
Funktion, Begriff, Bedeutung Göttingen 1994

F IV
G. Frege
Logische Untersuchungen Göttingen 1993

SL I
R. Stuhlmann Laeisz
Philosophische Logik Paderborn 2002


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Ed. Martin Schulz, access date 2017-05-24