Journal of Philosophical Logic 47 (4):673-691 (2018)

Guillermo Badia
University of Queensland
This paper defines a Sahlqvist fragment for relevant logic and establishes that each class of frames in the Routley-Meyer semantics which is definable by a Sahlqvist formula is also elementary, that is, it coincides with the class of structures satisfying a given first order property calculable by a Sahlqvist-van Benthem algorithm. Furthermore, we show that some classes of Routley-Meyer frames definable by a relevant formula are not elementary.
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DOI 10.1007/s10992-017-9445-y
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References found in this work BETA

Modal Logic.Patrick Blackburn, Maarten de Rijke & Yde Venema - 2001 - Studia Logica 76 (1):142-148.
Model Theory.Wilfrid Hodges - 2008 - Stanford Encyclopedia of Philosophy.

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The Philosophy of Logical Practice.Ben Martin - 2022 - Metaphilosophy 53 (2-3):267-283.

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