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Confessing to a Superfluous Premise (Roy Sorensen)

The Logic and Metaphysics Workshop will meet on March 12th from 4:15-6:15 in room 3309 of the CUNY Graduate Center for a talk by Roy Sorensen (WUSTL).

Title: Confessing to a Superfluous Premise

Abstract: In a hurried letter to beleaguered brethren, Blaise Pascal (1658) confesses to a lapse of concision: “I have made this longer than usual because I have not had time to make it shorter.”  Pascal’s confession was emulated with the same warmth as philosophers now emulate the apology introduced by D. C. Mackinson’s “The Preface Paradox”. Could Pascal’s confession of superfluity be sound? Pascal thinks his letter could be conservatively abridged; the shortened letter would be true and have the exact same content. In contrast to the Preface Paradox, where Mackinson’s author apologizes for false assertions, Pascal apologizes for an excess of true assertions. He believes at least one of his remarks could be deleted in a fashion that leaves all of its consequences entailed by the remaining assertions. Pascal’s confession of superfluity is plausible even if we count the apology as part of the letter (as we should since this is the most famous part of the letter). Yet there is an a priori refutation. Any conservative abridgement must preserve the implication that there is a superfluous assertion. This means any abridged version can itself be abridged. Since the letter is finite, we must eventually run out of conservative abridgements. Any predecessor of an unabridgeable abridgement is itself an unabridgeable.  So the original letter cannot be conservatively abridged.

Manuscript: for those interested, the manuscript has been made available for advance reading here.

The Metasemantics of Indefinite Extensibility (Vera Flocke)

The Logic and Metaphysics Workshop will meet on March 5th from 4:15-6:15 in room 3309 of the CUNY Graduate Center for a talk by Vera Flocke (NYU).

Title: The Metasemantics of Indefinite Extensibility

Abstract: Indefinite extensibility is the thesis that any domain of quantification can always be expanded. But how is the possibility of expanding domains of quantification reflected in the semantics of quantified sentences? This paper discusses the relevant meta-semantic options within a framework that distinguishes between semantic values and assertoric contents. This choice of a framework is independently motivated, helps received accounts of indefinite extensibility to escape weighty objections and adds to the available metasemantic options. I then argue for a hitherto overlooked view according to which quantified sentences express stable semantic values but variable assertoric contents. Specifically, the semantic value of quantified sentences are sets of possible worlds that are structured by two equivalence relations, one of which models counterfactual necessity and the other one of which models objectivity. Assertoric contents however are ordinary possible worlds propositions. The advantage of this view is that it explains succinctly what’s at issue in the debate between generality-absolutists, who think that quantification over absolutely everything is possible, and generality-relativists. If the box expresses objectivity, this disagreement concerns the Barcan formula, which entails that domains do not grow as one moves to objectively-accessible worlds.

A Dynamic Solution to the Liar Paradox (Martin Pleitz)

The Logic and Metaphysics Workshop will meet on February 26th from 4:15-6:15 in room 3309 of the CUNY Graduate Center for a talk by Martin Pleitz (Muenster).

Title: A Dynamic Solution to the Liar Paradox

Abstract: The Liar paradox arises when we combine the assumption that a sentence can refer to itself with our naïve notion of truth and apply our unrevised logic. Most current approaches to the Liar paradox focus on revising our notion of truth and logic because nowadays almost everyone is convinced that there are self-referential sentences. I will argue against this conviction. My argument starts from observations about the metaphysics of expressions: A meaningful expression is based in a syntactic expression which in turn is based in a non-semiotic object, and these are pairwise distinct. As all objects of this three-fold ontology exist only relative to contexts, we can import ideas from tense logic about how existence and reference can interact in a contextualist metaphysics. Semantico-metaphysical reasoning then shows that in this dynamic setting, an object can be referred to only after it has started to exist. Hence the self-reference needed in the Liar paradox cannot occur, after all. As this solution is contextualist, it evades the expressibility problems of other proposals.

Spring 2018 Schedule

The Logic and Metaphysics Workshop will be meeting on Mondays from 4:15 to 6:15 in room 3309 of the Graduate Center, CUNY (365 5th Avenue). The following is the schedule:

Feb 12. GC CLOSED. NO MEETING

Feb 19. GC CLOSED NO MEETING

Feb 26. Martin Pleitz, Muenster

Mar 5. Vera Flocke, NYU

Mar 12. Graham Priest, CUNY Roy Sorensen, WUSTL

Mar 19. Alex Citkin, Private Researcher

Mar 26. Chris Scambler, NYU

Apr 2. SPRING RECESS. NO MEETING

Apr 9. Greg Restall, Melbourne

Apr 16. Daniel Nolan, Notre Dame

Apr 23. Mel Fitting, CUNY

Apr 30. Sungil Han, Seoul National

May 7. Andreas Ditter, NYU

May 14. Rohit Parikh, CUNY