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Regular Cost Functions, Part I: Logic and Algebra over Words

Thomas Colcombet.

The theory of regular cost functions is a quantitative extension to the classical notion of regularity. A cost function associates to each input a non-negative integer value (or infinity), as opposed to languages which only associate to each input the two values "inside" and "outside". This theory&nbsp;[&hellip;]

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Controlling a random population

Thomas Colcombet ; Nathanaël Fijalkow ; Pierre Ohlmann.

Bertrand et al. introduced a model of parameterised systems, where each agent is represented by a finite state system, and studied the following control problem: for any number of agents, does there exist a controller able to bring all agents to a target state? They showed that the problem is&nbsp;[&hellip;]

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Automata Minimization: a Functorial Approach

Thomas Colcombet ; Daniela Petrişan.

In this paper we regard languages and their acceptors - such as deterministic or weighted automata, transducers, or monoids - as functors from input categories that specify the type of the languages and of the machines to categories that specify the type of outputs. Our results are as follows: A)&nbsp;[&hellip;]

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