Abstract
I review the problems involved in substituting into modal contexts, and state a rule which permits this to be done soundly. Such a rule justifies a expanded substitution process for modal logic. The process is syntactic but incurs proof obligations. I show constructs that permit the naming of objects outside the current modal contexts. These devices were motivated by problems found while using modal logic in planning.
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© 1991 Springer-Verlag London Limited
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Steel, S. (1991). Sound substitution into modal contexts. In: Steels, L., Smith, B. (eds) AISB91. Springer, London. https://doi.org/10.1007/978-1-4471-1852-7_21
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DOI: https://doi.org/10.1007/978-1-4471-1852-7_21
Publisher Name: Springer, London
Print ISBN: 978-3-540-19671-6
Online ISBN: 978-1-4471-1852-7
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