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On monotone modalities and adjointness

Published online by Cambridge University Press:  25 March 2011

MARTA BÍLKOVÁ
Affiliation:
Department of Logic, Charles University in Prague E-mail: marta.bilkova@ff.cuni.cz
JIŘÍ VELEBIL
Affiliation:
Faculty of Electrical Engineering, Czech Technical University in Prague, Czech Republic E-mail: velebil@math.feld.cvut.cz
YDE VENEMA
Affiliation:
Institute for Logic, Language and Computation, University of Amsterdam, The Netherlands E-mail: Y.Venema@uva.nl
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Abstract

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We fix a logical connection (Stone ˧ Pred : Setop → BA given by 2 as a schizophrenic object) and study coalgebraic modal logic that is induced by a functor T: Set → Set that is finitary and standard and preserves weak pullbacks and finite sets. We prove that for any such T, the cover modality nabla is a left (and its dual delta is a right) adjoint relative to ω. We then consider monotone unary modalities arising from the logical connection and show that they all are left (or right) adjoints relative to ω.

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Paper
Copyright
Copyright © Cambridge University Press 2011