relation: http://eprints.imtlucca.it/2591/ title: Extended differential aggregations in process algebra for performance and biology creator: Tschaikowski, Max creator: Tribastone, Mirco subject: QA75 Electronic computers. Computer science description: We study aggregations for ordinary differential equations induced by fluid semantics for Markovian process algebra which can capture the dynamics of performance models and chemical reaction networks. Whilst previous work has required perfect symmetry for exact aggregation, we present approximate fluid lumpability, which makes nearby processes perfectly symmetric after a perturbation of their parameters. We prove that small perturbations yield nearby differential trajectories. Numerically, we show that many heterogeneous processes can be aggregated with negligible errors. publisher: Open Publishing Association date: 2014-06 type: Book Section type: PeerReviewed format: application/pdf language: en rights: cc_by_nd identifier: http://eprints.imtlucca.it/2591/1/EPTCS_Tribastone_Tschaikowski.pdf identifier: Tschaikowski, Max and Tribastone, Mirco Extended differential aggregations in process algebra for performance and biology. In: Proceedings Twelfth International Workshop on Quantitative Aspects of Programming Languages and Systems. Electronic Proceedings in Theoretical Computer Science (154). Open Publishing Association, pp. 34-47. (2014) relation: http://dx.doi.org/10.4204/EPTCS.154.3 relation: 10.4204/EPTCS.154.3