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- PhD, 2016
- : Department of Philosophy
- : Philosophy
- Value Theory, Metaphysics and Epistemology
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- PhD, 1996
- : Department of Philosophy
- : Philosophy
- Logic and Philosophy of Logic, Ancient Greek and Roman Philosophy
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- PhD, 1997
- : Philosophy; Logic
- History of Logic, Ancient Greek and Roman Philosophy, Logic and Philosophy of Logic, Paradoxes, Logic and Philosophy of Logic, Miscellaneous
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- PhD, 2012
- : Department of Philosophy
- : Philosophy
- Epistemology, General Philosophy of Science, History of Western Philosophy
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- PhD, 1978
- : Department of Philosophy
- : Philosophy
- Time, Temporal Ontology, The Passage of Time, Aspects of Time, Philosophy of Time, Misc
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- PhD, 2009
- : Department of Philosophy
- : Philosophy
- Logic and Philosophy of Logic, Science, Logic, and Mathematics
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- PhD, 2006
- : Department of Philosophy
- : Philosophy
- Other Academic Areas, Environmental Philosophies, Environmental Philosophy
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- PhD, 2020
- : Department of Logic and Methodology of Sciences
- : Philosophy
- Science, Logic, and Mathematics, Philosophy of Language, Deontic Modals, Deontic Logic, Nonclassical Logics, Modal and Intensional Logic, Higher-Order Logic, Fictional Characters, Fiction, Truth in Fiction
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- PhD, 2017
- : Department of Philosophy
- : Philosophy
- History of Western Philosophy, Alfred North Whitehead, Metaphysics and Epistemology