Sensitivity, safety, and impossible worlds

Philosophical Studies 178 (3):713-729 (2021)
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Abstract

Modal knowledge accounts that are based on standards possible-worlds semantics face well-known problems when it comes to knowledge of necessities. Beliefs in necessities are trivially sensitive and safe and, therefore, trivially constitute knowledge according to these accounts. In this paper, I will first argue that existing solutions to this necessity problem, which accept standard possible-worlds semantics, are unsatisfactory. In order to solve the necessity problem, I will utilize an unorthodox account of counterfactuals, as proposed by Nolan, on which we also consider impossible worlds. Nolan’s account for counterpossibles delivers the intuitively correct result for sensitivity i.e. S’s belief is sensitive in intuitive cases of knowledge of necessities and insensitive in intuitive cases of knowledge failure. However, we acquire the same plausible result for safety only if we reject his strangeness of impossibility condition and accept the modal closeness of impossible worlds. In this case, the necessity problem can be analogously solved for sensitivity and safety. For some, such non-moderate accounts might come at too high a cost. In this respect, sensitivity is better off than safety when it comes to knowing necessities.

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Guido Melchior
University of Graz

Citations of this work

Hyperintensionality.Francesco Berto & Daniel Nolan - 2021 - Stanford Encyclopedia of Philosophy.
Epistemic Closure, Necessary Truths, and Safety.Bin Zhao - 2022 - American Philosophical Quarterly 59 (4):391-401.
A Dilemma for Globalized Safety.Bin Zhao - 2021 - Acta Analytica 37 (2):249-261.
Sensitivity, Safety, and Epistemic Closure.Bin Zhao - 2022 - International Journal of Philosophical Studies 30 (1):56-71.

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References found in this work

Counterfactuals.David K. Lewis - 1973 - Cambridge, MA, USA: Blackwell.
Philosophical Explanations.Robert Nozick - 1981 - Harvard University Press.
Epistemic Luck.Duncan Pritchard - 2005 - Oxford University Press UK.
Naming and Necessity.S. Kripke - 1972 - Tijdschrift Voor Filosofie 45 (4):665-666.

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