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arXiv · 2605.06268

Graded Monad Coalgebras for Continuous-Time Transition Systems

Elena Di Lavore·Jonas Forster·Mario Román
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Abstract

Functor coalgebras capture a wide range of transition systems that must however evolve in discrete steps. We introduce graded coalgebras of graded monads and propose them to model continuous-time transition systems. We develop the theory of graded coalgebras-including graded distributive laws between graded monads-and we give conditions for the existence of terminal coalgebras. We define both branching-time and trace semantics, linking them to recent work on Feller-Dynkin processes. Finally, we develop coalgebraic modal logics for both process semantics and state criteria for invariance and expressivity.

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Elena Di Lavore, Jonas Forster, Mario Román. 2026-05-07. Graded Monad Coalgebras for Continuous-Time Transition Systems. https://arxiv.org/abs/2605.06268

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