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  1. Singularity and personal identity.Ivan Welty - 2009 - Appraisal 7 (4).
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  2.  49
    Incompatibility, inconsistency, and logical analysis in Tractatus Logico-Philosophicus.Ivan Welty - 2021 - Synthese 199 (3-4):8171-8186.
    Statements of degree appear to falsify basic doctrines in Tractatus Logico-Philosophicus. I offer a fresh formulation of the challenge and assess a solution proposed on Wittgenstein’s behalf by Sarah Moss. I find that Moss’s proposal fails. The proposal rides in part on novel interpretations of pronouncements by Wittgenstein on the nature of the elementary proposition. I find that the interpretations cannot be sustained but that Moss’s textual case hints at important and overlooked features of the Tractarian program. I develop Wittgenstein’s (...)
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    Issue Introduction.Anthony Coleman & Ivan Welty - 2010 - Essays in Philosophy 11 (2):120-122.
  4.  74
    Frege on Indirect Proof.Ivan Welty - 2011 - History and Philosophy of Logic 32 (3):283-290.
    Frege's account of indirect proof has been thought to be problematic. This thought seems to rest on the supposition that some notion of logical consequence ? which Frege did not have ? is indispensable for a satisfactory account of indirect proof. It is not so. Frege's account is no less workable than the account predominant today. Indeed, Frege's account may be best understood as a restatement of the latter, although from a higher order point of view. I argue that this (...)
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  5. Frege on indirect proof. History and Philosophy of Logic, vol. 32.Ivan Welty - 2012 - Bulletin of Symbolic Logic 18 (2):273-274.
     
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  6.  15
    Wittgenstein’s Apprenticeship with Russell. [REVIEW]Ivan Welty - 2009 - Teaching Philosophy 32 (3):328-330.