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  1. Ivan Welty (2011). Frege on Indirect Proof. 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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  2. Anthony Coleman & Ivan Welty (2010). Issue Introduction. Essays in Philosophy 11 (2):1.
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  3. Ivan Welty (2009). Singularity and Personal Identity. Appraisal 7 (4).
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  4. Ivan Welty (2009). Wittgenstein's Apprenticeship with Russell. Teaching Philosophy 32 (3):328-330.