Journal of Philosophy 106 (5):255-276 (2009)

Joseph Diekemper
Queen's University, Belfast
This essay is an investigation into the existence of a very unusual and some would say unacceptably exotic type of property: namely, the property of being a certain individual; or, if you prefer, the property of being identical to a certain individual. In other words, this essay will investigate whether in spite of their exotic nature there are thisnesses, and, in particular, whether thisnesses are instantiated by events. Of course, I have not really said enough yet about thisnesses to motivate the criticism that such properties are exotic; for it might be the case that an individual x s thisness is merely a conjunction of all of x s qualitative properties. And, if we allow for the existence of all of the properties of an individual, it is not overly profligate to allow for the existence of this one additional conjunctive property. This, apparently, was Leibniz s view. Though seemingly ontologically mundane, however, such a qualitative1 thisness is not ontologically innocent. Given the definition of a thisness above, an individual s thisness is essential to it, and there are few philosophers who would wish to hold that all of an individual s properties are essential to it.2 Rather, it..
Keywords Analytic Philosophy  Contemporary Philosophy
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ISBN(s) 0022-362X
DOI 10.5840/jphil200910656
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The Virtues of Thisness Presentism.David Ingram - 2016 - Philosophical Studies 173 (11):2867-2888.
Non-Qualitative Properties.Sam Cowling - 2015 - Erkenntnis 80 (2):275-301.
Defining Qualitative Properties.Vera Hoffmann-Kolss - 2019 - Erkenntnis 84 (5):995-1010.
The Ontology of Thisness.Joseph Diekemper - 2015 - Philosophy and Phenomenological Research 90 (1):49-71.
Haecceitism.Sam Cowling - 2015 - Stanford Encyclopedia of Philosophy.

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