|A priori: something that we can know without prior (empirical) investigation. Is the inventory of a priori certainties purely logical? Is a priori knowledge always necessary?_____________Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.|
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|Re III 140 f
Original meter: at least at one time, a meter was defined by reference to this original meter. Therefore, we could know a priori that the original meter was one meter long. Nonetheless, it could have been longer or shorter. "The original meter is a meter long" is only contingently true, but a priori recognizable.
The separation between the necessary and the a priori: surprising consequence: every a priori statement is equivalent with a contingent statement! Proof: III 142: equal truth values provide equivalence)
Re III 140
Read: Ambiguous: a priori statements can all be contingent or necessary! - Distinction with rigid designator for truth value: not "the truth value of A" but "the actual truth value of A" - truth is not a property_____________Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.
Me I Albert Menne Folgerichtig Denken Darmstadt 1988
HH II Hoyningen-Huene Formale Logik, Stuttgart 1998
Re III Stephen Read Philosophie der Logik Hamburg 1997
Sal IV Wesley C. Salmon Logik Stuttgart 1983
Sai V R.M.Sainsbury Paradoxien Stuttgart 2001