In Krister Segerberg & Rysiek Sliwinski (eds.), Logic, Law, Morality: Thirteen Essays in Practical Philosophy in Honour of Lennart Åqvist. Uppsala: Department of Philosophy, Uppsala University. pp. 79-95 (2003)

Authors
Berislav Žarnić
University Zagreb
Abstract
The ambition of the paper is to provide a solution to the problem posed by Von Wright (1999): how is it possible that the two actions, one of producing P and the other of preventing P can have different deontic status, the former being obligatory and the latter being forbidden. The solution for the problem is sought for by an investigation into connections between imperative and deontic logic. First, it is asked whether a solution could be found in Lemmon's (1965) system of "change logic", using his idea on connection between logic of orders being in force and deontic logic. The answer is the negative one. Next, the connection between Lemmon's imperative logic and deontic logic given in Aqvist's paper - "Next" and "Ought" (1965) - is analyzed. Than, the Lemmon's treatment of imperatives is restricted to the natural language imperatives and Aqvist's way of connecting imperative and deontic logic is modified accordingly. Some principles for the natural language imperatives are established (the negation rule ; the law of contraposition for imperative conditionals) and a simple "global" semantics is developed. The notion of "opposite action" is introduced and it is given an important role in semantics. Finally, a solution for von Wright's problem is given. In the closing sections some further topics for investigation are hinted: one of them being the connection between Aqvist's epistemic- imperative conception of interrogatives and "epistemic obligations", the other being formalization of the idea that imperatives create and re-create obligation patterns that can be described in deontic terms.
Keywords deontic logic  imperative logic  negation
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References found in this work BETA

Scorekeeping in a Language Game.David Lewis - 1979 - Journal of Philosophical Logic 8 (1):339--359.
Scorekeeping in a Language Game.David Lewis - 1979 - Journal of Philosophical Logic 8 (3):339.
Defaults in Update Semantics.Frank Veltman - 1996 - Journal of Philosophical Logic 25 (3):221 - 261.
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Citations of this work BETA

A Preference Semantics for Imperatives.William B. Starr - 2020 - Semantics and Pragmatics 20.
Dynamic Logic of Preference Upgrade.Johan van Benthem & Fenrong Liu - 2007 - Journal of Applied Non-Classical Logics 17 (2):157-182.
Prioritized Imperatives and Normative Conflicts.Fengkui Ju & Fenrong Liu - 2011 - European Journal of Analytic Philosophy 7 (2):35-58.
Is Unsaying Polite?Berislav Žarnić - 2012 - In Majda Trobok, Nenad Miščević & Berislav Žarnić (eds.), Between Logic and Reality: Modeling Inference, Action and Understanding. Springer. pp. 201--224.

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