Philosophy Lexicon of Arguments

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?
Author Item Excerpt Meta data
Logic Texts
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A priori 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
Logic Texts
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

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Ed. Martin Schulz, access date 2017-04-28