Philosophy Lexicon of Arguments

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Prior, Arthur
 
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Empty Set I 63 ~
empty set / Prior: creates only the logical construction identity between unicorns and Pegasi - a logical structure is not any sort of entity - ((s) there is only one empty set, so unlike anything - makes unicorns and Pegasi not comparable because it has no elements).
I 63 ~
empty set / Prior: solution: to say that there is exactly one null class, is simply: for a f: nothing f-ts and for each f and y, nothing f-ts and nothing y-ts - then whatever y-ts,f-ts and whatever y-ts, f-ts - related: relation-in-extension.

Pri I
A. Prior
Objects of thought Oxford 1971

Pri II
Arthur N. Prior
Papers on Time and Tense 2nd Edition Oxford 2003


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