André Gallois is a contemporary analytic philosopher known for his work on metaphysics, particularly the theory of occasional identity — the view that numerical identity can hold between objects at some times but not others. He has also contributed to philosophy of language and epistemology, including debates about self-knowledge and first-person authority.
Developed the theory of occasional identity, arguing identity is a time-relative rather than eternal relation
Authored Occasions of Identity: The Metaphysics of Persistence, Change, and Sameness (Oxford University Press, 1998)
Contributed to the philosophy of first-person authority in The World Without, The Mind Within
Worked on individuation of linguistic tokens and the type/token distinction
Applied identity theory to problems in philosophy of language including inscription and interpretation
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