What is the Paradox of Logical Validity?

old_uid11063
titleWhat is the Paradox of Logical Validity?
start_date2012/03/15
schedule16h30-18h30
onlineno
location_infoPavillon Jardin, salle de réunion
detailsFor questions and further information concerning Roy Cook's visit, feel free to email isidora.stojanovic@ens.fr
summaryRecently, a number of authors, including JC Beall & Julien Murzi, Bruno Whittle, Lionel Shapiro, and Hartry Field, have suggested that there is a paradox of logical validity. In short, the claim is that adding a logical validity predicate (or equivalent resources) to any theory that supports diagonalization leads to a variant of the Curry paradox. I will show that the extant derivations of the paradox in the literature are fallacious, and then provide a non-fallacious version of the paradox. The talk concludes with a discussion of what the amended paradox has to teach us about the logical status of the validity predicate.
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