Durham E-Theses The ontology of haecceities ZHANG, RUOYU How to cite: ZHANG, RUOYU (2019) The ontology of haecceities, Durham theses, Durham University. Available at Durham E-Theses Online: http://etheses.dur.ac.uk/12963/ Use policy The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in Durham E-Theses • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. Please consult the full Durham E-Theses policy for further details. Academic Support Oce, Durham University, University Oce, Old Elvet, Durham DH1 3HP e-mail:
[email protected] Tel: +44 0191 334 6107 http://etheses.dur.ac.uk The Ontology of Haecceities A Solution to the Problem of Distinction Ruoyu Zhang Submitted for the degree of Ph.D. in Philosophy Durham University Department of Philosophy October 2018 Short Thesis Abstract This thesis deals with the Problem of Distinction, i.e. what explains the distinction of two substances, especially when they are qualitatively indiscernible? It argues that the best solution to this problem is an ontology of haecceities, properties like “being identical with X” which is unique for X and responsible for its individuation. This is achieved in two steps. In the first half of the thesis (Chapters 2 to 5), the nature of the Problem of Distinction is clarified and Principles of Evaluations of the solution to the Problem of Distinction are set out.