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  1. A New Universal Bundle Theory.Ruoyu Zhang - 2018 - Philosophia 46 (2):473-486.
    Universal Bundle Theory holds that objects are fundamentally identical with bundles of universals. Universals are multiply instantiable properties. One popular objection to UBT concerns the possibility of distinct indiscernibles. There are mainly two replies in the literature, corresponding to two representative UBTs, which I shall call the Identity-View and the Instance-View. Each view faces serious problems. This paper proposes a new version of UBT and argues that it is better than these other two versions.
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    Haecceity Mereology.Ruoyu Zhang - 2022 - Metaphysica 23 (2):275-294.
    Haecceities are non-qualitative properties for individuation but the current theories about haecceities are still to be much more explored. This paper aims to develop a “haecceity mereology” – that is, an ontological system that understands substances as mereological combinations of haecceities and qualitative properties. In this way, the view developed is an alternative to Paul’s : 578–96; 2006. “Coincidence as Overlap.” Noûs 40 : 623–59) mereological approach. Three rules are proposed: If S is a substance, then there is one and (...)
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    Composition Restrictedness and Bruteness Revisited.Ruoyu Zhang - forthcoming - Theoria:e70001.
    In metaphysics, ‘brutal composition’ is supported by few philosophers except Ned Markosian, however, the detailed meaning of composition bruteness, and the related notion of restrictedness, has not been seriously discussed. I offer a novel and systematic account of composition restrictedness and bruteness, in which different senses of ‘restricted’ and ‘bruteness’ are explored, and I argue this can help to understand some interesting but neglected positions about composition, like ‘restricted universalism’.
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    The Category Mistake of Locating Properties in Spacetime and Platonic Immanence.Ruoyu Zhang - 2024 - Revista Portuguesa de Filosofia 80 (4):1187-1214.
    This paper challenges the traditional metaphysical assumption that properties can be located in spacetime and examines the ontological implications of categorizing spacetime itself. By introducing a two-category ontology, we argue that attempts to locate properties in spacetime represent a category mistake, as this notion fails to address the fundamental categorization of spacetime. We propose that the notion of instantiation should be conceptually separated from spatiotemporal location, thereby allowing for properties that are Platonic yet immanent. Furthermore, we reevaluate the debate between (...)
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