Enhanced coalgebraic bisimulation
Abstract
We present a systematic study of bisimulation-up-to techniques for
coalgebras. This enhances the bisimulation proof method for a large
class of state based systems, including labelled transition systems but
also stream systems and weighted automata. Our approach allows for compositional reasoning about the soundness of enhancements. Applications include the soundness of bisimulation up to bisimilarity, up to equivalence and up to congruence. All in all, this gives a powerful and modular framework for simplified coinductive proofs of equivalence.

