Can Hardcore Actualism Validate S5?

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Abstract

Hardcore actualism (HA) grounds all modal truths in the concrete constituents of the actual world (see, e.g., Borghini and Williams (2008), Jacobs (2010), Vetter (2015)). I bolster HA, and elucidate the very nature of possibility (and necessity) according to HA, by considering if it can validate S5 modal logic. Interestingly, different considerations pull in different directions on this issue. To resolve the tension, we are forced to think hard about the nature of the hardcore actualist's modal reality and how radically this departs from possible worlds orthodoxy. Once we achieve this departure, the prospects of a hardcore actualist validation of S5 look considerably brighter. This paper thus strengthens hardcore actualism by arguing that it can indeed validate S5–arguably the most popular logic of metaphysical modality–and, in the process, it elucidates the very nature of modality according to this revisionary, but very attractive, modal metaphysics.
Original languageEnglish
Number of pages17
JournalPHILOSOPHY AND PHENOMENOLOGICAL RESEARCH
Early online date23 Oct 2019
DOIs
Publication statusE-pub ahead of print - 23 Oct 2019

Keywords

  • S5
  • actualism
  • hardcore actualism
  • logic
  • modality
  • possible worlds
  • potentiality

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