Abstract
Here I present an analysis of what it is for an x and a y to be the same F. Unlike the Fregean Analysis (FRE), according to which ‘x is the same F as y’ is equivalent to ‘x is an F, y is an F, and x = y’, the analysis presented and defended here allows that there are possible cases in which x and y are the same F 1 but not the same F 2 even though x is an F 2 and y is an F 2 . The analysis offered here, FRE+, retains the conditions that FRE deems are necessary for being the same F while adding a further condition to allow that the same F 1 can be a different F 2 . Although FRE+ is compatible with there being such cases, FRE+ shares with FRE that the identity mentioned in the analysis is nothing other than absolute identity. Thus, FRE+ offers a way to allow that the same F 1 can be a different F 2 while avoiding conflict with the traditionally accepted logic of identity, and I argue without conflict with the Indiscernibility of Identicals in particular.
References
Baber, H. E. 2015. “The Trinity: Relative Identity Redux.” Faith and Philosophy 32 (2): 161–71. https://doi.org/10.5840/faithphil201541336.Search in Google Scholar
Baber, H. E. 2016. “Trinity, Generality, and Dominance.” Religious Studies 52 (4): 435–49. https://doi.org/10.1017/s003441251500058x.Search in Google Scholar
Boeker, R. 2021. Locke on Persons and Personal Identity. Oxford: Oxford University Press.10.1093/oso/9780198846758.001.0001Search in Google Scholar
Deutsch, H. 1998. “Identity and General Similarity.” Philosophical Perspectives 12: 177–99. http://www.jstor.org/stable/2676146.10.1111/0029-4624.32.s12.8Search in Google Scholar
Deutsch, H., and P. Garbacz. 2023. “Relative Identity.” In The Stanford Encyclopedia of Philosophy, Fall 2023 ed., edited by E. N. Zalta, and U. Nodelman. Stanford: Metaphysics Research Lab, Department of Philosophy, Stanford University. https://plato.stanford.edu/archives/fall2023/entries/identity-relative/.Search in Google Scholar
Garbacz, P. 2002. “Logics of Relative Identity.” Notre Dame Journal of Formal Logic 43 (1): 27–50. https://doi.org/10.1305/ndjfl/1071505768.Search in Google Scholar
Garbacz, P. 2004. “Subsumption and Relative Identity.” Axiomathes 14 (4): 341–60. https://doi.org/10.1023/b:axio.0000024900.72089.a9.10.1023/B:AXIO.0000024900.72089.a9Search in Google Scholar
Geach, P. T. 1957. Mental Acts: Their Content and Their Objects. London: Routledge and Kegan Paul.Search in Google Scholar
Geach, P. T. 1962. Reference and Generality: An Examination of Some Medieval and Modern Theories. Ithaca, NY: Cornell University Press.Search in Google Scholar
Geach, P. T. 1967. “Identity.” The Review of Metaphysics 21 (1): 3–12.Search in Google Scholar
Griffin, N. 1977. Relative Identity. Oxford: Clarendon Press.Search in Google Scholar
Grandy, R. E., and M. A. Freund. 2023. “Sortals.” In The Stanford Encyclopedia of Philosophy, Summer 2023 ed., edited by E. N. Zalta, and U. Nodelman. Stanford: Metaphysics Research Lab, Department of Philosophy, Stanford University. https://plato.stanford.edu/archives/sum2023/entries/sortals/.Search in Google Scholar
Gupta, A. 1980. The Logic of Common Nouns: An Investigation in Quantified Modal Logic. New Haven: Yale University Press.Search in Google Scholar
Mackie, D. 1999. “Personal Identity and Dead People.” Philosophical Studies 95 (3): 219–42. https://doi.org/10.1023/a:1004239225105.10.1023/A:1004239225105Search in Google Scholar
Molto, D. 2019. “Relativizing Identity.” Thought: A Journal of Philosophy 8 (4): 260–9. https://doi.org/10.1002/tht3.430.Search in Google Scholar
Noonan, H. 2017. “Relative Identity.” In A Companion to the Philosophy of Language, 2nd ed., edited by B. Hale, C. Wright, and A. Miller, 1013–32. Chichester, West Sussex: Wiley-Blackwell.10.1002/9781118972090.ch40Search in Google Scholar
Noonan, H., and B. Curtis. 2022. “Identity.” In The Stanford Encyclopedia of Philosophy, Fall 2022 ed., edited by E. N. Zalta, and U. Nodelman. Stanford: Metaphysics Research Lab, Department of Philosophy, Stanford University. https://plato.stanford.edu/archives/fall2022/entries/identity/.Search in Google Scholar
Odegard, D. 1972. “Identity through Time.” American Philosophical Quarterly 9 (1): 29–38.Search in Google Scholar
Olson, E. T. 1997. The Human Animal: Personal Identity without Psychology. New York: Oxford University Press.Search in Google Scholar
Perry, J. 1970. “The Same F.” The Philosophical Review 79 (2): 181–200, https://doi.org/10.2307/2183947.Search in Google Scholar
Quine, W. V. O. 1964. “Review of Reference and Generality.” The Philosophical Review 73 (1): 100–4. https://doi.org/10.2307/2183205.Search in Google Scholar
Rea, M. C. 2003. “Relative Identity and the Doctrine of the Trinity.” Philosophia Christi 5 (2): 431–45. https://doi.org/10.5840/pc20035247.Search in Google Scholar
Routley, R., and N. Griffin. 1979. “Towards a Logic of Relative Identity.” Logique et Analyse 22 (85/86): 65–83.Search in Google Scholar
Snowdon, P. 2009. “On the Sortal Dependency of Individuation Thesis.” In From Truth to Reality: New Essays in Logic and Metaphysics, edited by H. Dyke, 254–71. New York and Oxon: Routledge.Search in Google Scholar
Stevenson, L. 1972. “Relative Identity and Leibniz’s Law.” The Philosophical Quarterly 22 (87): 155–8. https://doi.org/10.2307/2217543.Search in Google Scholar
van Inwagen, P. 1988. “And yet They Are Not Three Gods but One God.” In Philosophy and the Christian Faith, edited by T. V. Morris, 241–78. Notre Dame: University of Notre Dame Press.Search in Google Scholar
Wiggins, D. 1967. Identity and Spatio-Temporal Continuity. Oxford: Blackwell.Search in Google Scholar
Wiggins, D. 2001. Sameness and Substance Renewed. Cambridge: Cambridge University Press.10.1017/CBO9780511612756Search in Google Scholar
Zemach, E. M. 1974. “In Defence of Relative Identity.” Philosophical Studies 26 (3/4): 207–18, https://doi.org/10.1007/bf00398879.Search in Google Scholar
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Articles in the same Issue
- Frontmatter
- Original Papers
- Change and Location: A New and Old Case against Functionality
- The Dualist Metaphysics of the Incarnation and the Too Many Thinkers Problem
- The Transcendent and Causal Dimensions of Aquinas’s Action Theory: Insights from Metaphysics
- Aspectual Compresence
- Why Trope Metaphysics is Better than the Theory of Universals?
- Free Will: Evidence for the Existence of Soul
- The Same F 1 but a Different F 2 – with Absolute Identity
- The Subtraction Argument in an Infinite World
- Making Sense of Simultaneity: A Reply to Wahlberg
- Events and Facts in the Image of Modes
- Why There is No Us in Consciousness: You Are Simple, a Bodily Soul
Articles in the same Issue
- Frontmatter
- Original Papers
- Change and Location: A New and Old Case against Functionality
- The Dualist Metaphysics of the Incarnation and the Too Many Thinkers Problem
- The Transcendent and Causal Dimensions of Aquinas’s Action Theory: Insights from Metaphysics
- Aspectual Compresence
- Why Trope Metaphysics is Better than the Theory of Universals?
- Free Will: Evidence for the Existence of Soul
- The Same F 1 but a Different F 2 – with Absolute Identity
- The Subtraction Argument in an Infinite World
- Making Sense of Simultaneity: A Reply to Wahlberg
- Events and Facts in the Image of Modes
- Why There is No Us in Consciousness: You Are Simple, a Bodily Soul