Authors
Peter Vranas
University of Wisconsin, Madison
Abstract
I was quite excited when I first read Restall and Russell’s (2010) paper. For two reasons. First, because the paper provides rigorous formulations and formal proofs of implication barrier the- ses, namely “theses [which] deny that one can derive sentences of one type from sentences of another”. Second (and primarily), because the paper proves a general theorem, the Barrier Con- struction Theorem, which unifies implication barrier theses concerning four topics: generality, necessity, time, and normativity. After thinking about the paper, I am satisfied with its treatment of the first three topics, namely generality, necessity, and time. But I am not satisfied with its treatment of normativity, so my comments are exclusively on that topic.
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References found in this work BETA

Deontic Logic.G. H. von Wright - 1951 - Mind 60 (237):1-15.
Logic and the Autonomy of Ethics.Charles R. Pigden - 1989 - Australasian Journal of Philosophy 67 (2):127 – 151.
Barriers to Implication.Gillian Russell & Greg Restall - 2010 - In Charles Pigden (ed.), Hume on Is and Ought. Palgrave MacMillan.
The Autonomy of Ethics.A. N. Prior - 1960 - Australasian Journal of Philosophy 38 (3):199 – 206.

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Russell's Completeness Proof.Peter Milne - 2008 - History and Philosophy of Logic 29 (1):31-62.
Barriers to Implication.Gillian Russell & Greg Restall - 2010 - In Charles Pigden (ed.), Hume on Is and Ought. Palgrave MacMillan.
Full-Blooded Reference.Gabriel Rabin - 2007 - Philosophia Mathematica 15 (3):357-365.
Truthmakers, Entailment and Necessity.Greg Restall - 1996 - Australasian Journal of Philosophy 74 (2):331 – 340.

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