A naive way to solve the model-checking problem of the mu-calculus uses fixpoint iteration. Traditionally however mu-calculus model-checking is solved by a reduction in linear time to a parity game, which is then solved using one of the many algorithms for parity games.We now consider a method of solving parity games by means of a naive fixpoint iteration. Several fixpoint algorithms for parity games have been proposed in the literature. In this work, we introduce an algorithm that relies on the notion of a distraction. The idea is that this offers a novel perspective for understanding parity games. We then show that this algorithm is in fact identical to two earlier published fixpoint algorithms for parity games and thus that these earlier algorithms are the same.Furthermore, we modify our algorithm to only partially recompute deeper fixpoints after updating a higher set and show that this modification enables a simple method to obtain winning strategies.We show that the resulting algorithm is simple to implement and offers good performance on practical parity games. We empirically demonstrate this using games derived from model-checking, equivalence checking and reactive synthesis and show that our fixpoint algorithm is the fastest solution for model-checking games.
ANIMO is a Cytoscape 3 app to model biological signalling pathways. Useful analyses can be performed and displayed to the user in an effective way. However, all this power comes at a cost: the additional software requirements for ANIMO have been hindering its widespread adoption. Our goal has been to provide beginner to intermediate ANIMO users with a simpler and more effective platform to perform their research: webANIMO. The minimalistic interface provides everything the regular ANIMO user needs for the most common tasks. Adding the fact that it is a web interface removes any software requirements from the equation. This article describes how webANIMO works: its client/server architecture, how Cytoscape and ANIMO compatibility was maintained, the visualization techniques implemented and other general design decisions.
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