|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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Necessary/not a priori: E.g. Goldbach’s conjecture: If it will turn out, then by necessity.
A priori/not necessary: E.g. determining the reference of the term "one meter": it is possible to know a priori that the length of this stick is one meter, and this would not be seen as a necessary truth.
Difference: a priori/necessary: Kripke: you could empirically discover the essence (e.g. water = H20)._____________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.
Name und Notwendigkeit Frankfurt 1981
S. A. Kripke
Outline of a Theory of Truth (1975)
Recent Essays on Truth and the Liar Paradox, R. L. Martin (Hg), Oxford/NY 1984