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Designing Normative Theories of Ethical Reasoning: Formal Framework, Methodology, and Tool Support

25 March 2019
Christoph Benzmüller
X. Parent
Leendert van der Torre
    AILaw
ArXiv (abs)PDFHTML
Abstract

A framework and methodology---termed LogiKEy---for the design and engineering of ethical reasoners, normative theories and deontic logics is presented. The overall motivation is the development of suitable means for the control and governance of intelligent autonomous systems. LogiKEy's unifying formal framework is based on semantical embeddings of deontic logics, logic combinations and ethico-legal domain theories in expressive classic higher-order logic. This meta-logical approach enables the provision of powerful tool support in LogiKEy with small effort: off-the-shelf theorem provers and model finders for higher-order logic are assisting the LogiKEy designer of ethical intelligent agents to flexibly experiment with underlying logics and their combinations, with ethico-legal domain theories, and with concrete examples---all at the same time. Continuous improvements of these off-the-shelf provers, without further ado, leverage the reasoning performance in LogiKEy. Case studies, in which the LogiKEy framework and methodology has been applied and tested, give early evidence that HOL's undecidability often does not hinder efficient experimentation.

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