Divide and Congruence II: From Decomposition of Modal Formulas to Preservation of Delay and Weak Bisimilarity
(1604.07530)Abstract
Earlier we presented a method to decompose modal formulas for processes with the internal action $\tau$, and congruence formats for branching and $\eta$-bisimilarity were derived on the basis of this decomposition method. The idea is that a congruence format for a semantics must ensure that the formulas in the modal characterisation of this semantics are always decomposed into formulas that are again in this modal characterisation. In this follow-up paper the decomposition method is enhanced to deal with modal characterisations that contain a modality $\langle\epsilon\rangle\langle a\rangle\phi$, to derive congruence formats for delay and weak bisimilarity.
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