Abstract
The fact that many modal operators are part of an adjunction is probably folklore since the discovery of adjunctions. On the other hand, the natural idea of a minimal propositional calculus extended with a pair of adjoint operators seems to have been formulated only very recently. This recent research, mainly motivated by applications in computer science, concentrates on technical issues related to the calculi and not on the significance of adjunctions in modal logic. It then seems a worthy enterprise (both for these contemporary topical pursuits and also for historical interest) to trace the concept of adjunction back to the origins of the algebraic semantics of modal logic and to make explicit its ubiquity in this branch of mathematics.
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Menni, M., Smith, C. Modes of Adjointness. J Philos Logic 43, 365–391 (2014). https://doi.org/10.1007/s10992-012-9266-y
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DOI: https://doi.org/10.1007/s10992-012-9266-y