Philosophy Lexicon of Arguments

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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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IL 96
A Priori/Wittgenstein: that would have to be a set whose meaning guaranteed its truth - but the meaning requires that we verify the sentence - ((s) verificationism: can then not accept analytic truths).
II 96/97
A Priori/Wittgenstein: expressions that look a priori must be explained - the same expression can be a sentence or a hypothesis - thus, the same expression may be equation or hypothesis - equation: necessary - in visual space, it is a priori that an equilateral triangle is equiangular - you cannot see one without seeing the other - physical space: here not a priori, because the triangle may be inclined.
II 98
A Priori/Seeming/Appearing/Wittgenstein: "This chair looks green" here, our certainty is of logical nature and a priori.
III 233
A Priori/Necessity/Wittgenstein/Late/Pile: he does not concede the a priori grammatical sentences a form of absolute necessity.

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.

L. Wittgenstein
Vorlesungen 1930-35 Frankfurt 1989

L. Wittgenstein
Das Blaue Buch - Eine Philosophische Betrachtung Frankfurt 1984

L. Wittgenstein
Tractatus Logico Philosophicus Frankfurt/M 1960

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Ed. Martin Schulz, access date 2018-04-20