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Quantifiers on languages and codensity monads

Abstract:
This paper contributes to the techniques of topo-algebraic recognition for languages beyond the regular setting as they relate to logic on words. In particular, we provide a general construction on recognisers corresponding to adding one layer of various kinds of quantifiers and prove a corresponding Reutenauer-type theorem. Our main tools are codensity monads and duality theory. Our construction hinges on a measure-theoretic characterisation of the profinite monad of the free S-semimodule monad for finite and commutative semirings S, which generalises our earlier insight that the Vietoris monad on Boolean spaces is the codensity monad of the finite powerset functor.
Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1017/S0960129521000074

Authors


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Institution:
University of Oxford
Division:
MPLS
Department:
Computer Science
Role:
Author


Publisher:
Cambridge University Press
Journal:
Mathematical Structures in Computer Science More from this journal
Volume:
30
Issue:
10
Pages:
1054-1088
Publication date:
2021-06-23
Acceptance date:
2021-05-01
DOI:
EISSN:
1469-8072
ISSN:
0960-1295


Language:
English
Keywords:
Pubs id:
1175087
Local pid:
pubs:1175087
Deposit date:
2021-05-08

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