Philosophy Lexicon of Arguments

Author Item Excerpt Meta data
Poincaré, H.
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Impredicativeness Thiel I 324
Impredicativeness/Paradoxes/Poincaré: Poincaré believed with this that the decisive criterion had been found: illegitimate, "non-predicative" conditions are those that contain such a circle. ( > impredicative, Russell).
At first, it seemed sufficient to require expressions for the relation between element and set that in "x  y" the second relation term y should belong to exactly one step higher than x (simple > type theory), thus the requirement that each permissible expression should be formed not only "predicatively" itself (i.e. not impredicatively) but also all arguments occurring in it must meet this condition, to form a "> branched type theory".

Chr. Thiel
Philosophie und Mathematik Darmstadt 1995

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Ed. Martin Schulz, access date 2017-04-29