3 papers
cs.LO2026
A Unified Treatment of Substitution for Presheaves, Nominal Sets, Renaming Sets, and so on
Fabian Lenke, Stefan Milius, Henning Urbat
Presheaves and nominal sets provide alternative abstract models of sets of syntactic objects with free and bound variables, such as lambda-terms. One distinguishing feature of the…
cs.LO2026
Codensity Monads via Density and Duality
Fabian Lenke, Nico Wittrock, Stefan Milius +1
Codensity monads provide a universal method to generate complex monads from simple functors. Recently, a wide range of important monads in logic, denotational semantics, and probab…
cs.FL2025
Extended Stone Duality via Monoidal Adjunctions
Fabian Lenke, Henning Urbat, Stefan Milius
Extensions of Stone-type dualities have a long history in algebraic logic and have also been instrumental in proving results in algebraic language theory. We show how to extend abs…