From Ideal Worlds to Ideality

Journal of the American Philosophical Association 9 (1):114-134 (2023)
  Copy   BIBTEX


In common treatments of deontic logic, the obligatory is what is true in all deontically ideal possible worlds. In this article, I offer a new semantics for Standard Deontic Logic with Leibnizian intensions rather than possible worlds. Even though the new semantics furnishes models that resemble Venn diagrams, the semantics captures the strong soundness and completeness of Standard Deontic Logic. Since, unlike possible worlds, many Leibnizian intensions are not maximally consistent entities, we can amend the semantics to invalidate the inference rule which ensures that all tautologies are obligatory. I sketch this amended semantics to show how it invalidates the rule in a new way.

Similar books and articles

Logic Through a Leibnizian Lens.Craig Warmke - 2019 - Philosophers' Imprint 19.
For a Dynamic Semantics of Necessity Deontic Modals.Alessandra Marra - 2016 - In Olivier Roy, Allard Tamminga & Malte Willer (eds.), Deontic Logic and Normative Systems. London, UK: College Publications. pp. 124-138.
Multiplex semantics for deontic logic.Lou Goble - 2000 - Nordic Journal of Philosophical Logic 5 (2):113-134.
Modal Semantics without Worlds.Craig Warmke - 2016 - Philosophy Compass 11 (11):702-715.
Possible Worlds Semantics.Daniel Nolan - 2012 - In Gillian Russell Delia Graff Fara (ed.), The Routledge Companion to Philosophy of Language. Routledge. pp. 242-252.
Modal Intensionalism.Craig Warmke - 2015 - Journal of Philosophy 112 (6):309-334.
Mally’s Deontic Logic: Reducibility and Semantics.Gert-Jan C. Lokhorst - 2015 - Journal of Philosophical Logic 44 (3):309-319.
Deontic Logic and Natural Language.Fabrizio Cariani - forthcoming - In Dov Gabbay, Ron van der Meyden, John Horty, Xavier Parent & Leandert van der Torre (eds.), The Handbook of Deontic Logic (Vol. II). College Publications.
Obligation as Optimal Goal Satisfaction.Robert Kowalski & Ken Satoh - 2018 - Journal of Philosophical Logic 47 (4):579-609.


Added to PP

448 (#45,460)

6 months
105 (#44,889)

Historical graph of downloads
How can I increase my downloads?

Author's Profile

Craig Warmke
Northern Illinois University

Citations of this work

No citations found.

Add more citations

References found in this work

Counterfactuals.David Lewis - 1973 - Foundations of Language 13 (1):145-151.
Counterfactuals.David Lewis - 1973 - Tijdschrift Voor Filosofie 36 (3):602-605.
Ought, Agents, and Actions.Mark Schroeder - 2011 - Philosophical Review 120 (1):1-41.
Ought, Agents, and Actions.Mark Schroeder - 2010 - Philosophical Review 119 (3):1-41.

View all 20 references / Add more references