Medieval vs Contemporary Metaphysics and Logic of Intentionality

Dissertation, (2017)

Andrzej Bułeczka
Jagiellonian University
This thesis addresses three challenges posed by intentionality - the ability of our mental states and language to be about something - to a logician: an apparent reference to non-existent objects, intentional indeterminacy and the failure of substitutivity of coextensive terms in an intentional context. Since intentionality plays an important role in our everyday reasoning, a proper formal account of it is highly desirable, yet it requires a departure from classical logic. One can modify classical logic and adapt the formal apparatus to account for the aforementioned problems (Graham Priest’s logic for intentionality serves as an example of such an approach in this work) or one can make an even more radical shift and seek for inspiration in a different logical tradition like the terminist logic developed in the Late Middle Ages by figures like William of Ockham or John Buridan. The second path is explored here as a modest attempt to show that once we abandon the bias against the history of logic as irrelevant, we can actually get access to firm logical solutions inaccessible from a classical perspective, while still practising logic proper.
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Naming and Necessity.Saul Kripke - 1981 - Philosophy 56 (217):431-433.
The Objects of Thought.Tim Crane - 2013 - Oxford: Oxford University Press.
Existence as a Real Property.Francesco Berto - 2012 - Synthèse Library, Springer.

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