G.J.C. Lokhorst. Mally's deontic logic. In Edward N. Zalta, ed., Stanford Encyclopedia of Philosophy. The Metaphysics Research Lab at the Center for the Study of Language and Information, Stanford University, Stanford, CA, 2002. ISSN 1095-5054. With computer program.
Abstract. In 1926, Mally presented the first formal system of deontic logic. His system had several consequences which Mally regarded as surprising but defensible. It also had a consequence (A is obligatory if and only if A is the case) which Menger (1939) and almost all later deontic logicians have regarded as unacceptable. We give an exposition of Mally's system and discuss how it may be repaired.
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