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- PhD, 2016
- Medieval and Renaissance Philosophy, Ancient Greek and Roman Philosophy
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- PhD, 1980
- Metaphysics and Epistemology, History of Western Philosophy, Science, Logic, and Mathematics
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- PhD, 2015
- 19th Century Philosophy, 19th Century Austrian Philosophy, 19th Century German Philosophy, 19th Century Philosophy, Miscellaneous, 19th Century French Philosophy
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- PhD
- Conditionals, Epistemology, General Philosophy of Science, Philosophy of Language, Logic and Philosophy of Logic
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- PhD, 2009
- Logic and Philosophy of Logic, Ancient Greek and Roman Philosophy, Medieval and Renaissance Philosophy
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- PhD, 2011
- Philosophy of Language, Inferentialist Accounts of Meaning and Content
