human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "differentially positive systems"
  Abstract: The paper introduces and studies differentially positive systems, that is, systems whose linearization along an arbitrary trajectory is positive. A generalization of Perron Frobenius theory is developed in this differential framework to show that the property induces a (conal) order that strongly constrains the asymptotic behavior of solutions. The results illustrate that behaviors constrained by local order properties extend beyond the well-studied class of linear positive systems and monotone systems, which both require a constant cone field and a linear state space.

Connected through hyperedge HE-1 (induced by source paper "differential dissipativity theory for dominance analysis"):
  with members:
    - "a dissipativity theorem for p dominant systems"
    - "differential positivity on compact sets"
    - "on differentially dissipative dynamical systems"
    - "on differential passivity of physical systems"
    - "a differential lyapunov framework for contraction analysis"

Connected through hyperedge HE-2 (induced by source paper "stability theory of stochastic models in opinion dynamics"):
  with members:
    - "novel multidimensional models of opinion dynamics in social networks"
    - "a contractive approach to separable lyapunov functions for monotone systems"
    - "distributed evaluation and convergence of self appraisals in social networks"
    - "a differential lyapunov framework for contraction analysis"

Connected through hyperedge HE-3 (induced by source paper "a dissipativity theorem for p dominant systems"):
  with members:
    - "differential positivity on compact sets"
    - "differential analysis of nonlinear systems revisiting the pendulum example"
    - "a differential lyapunov framework for contraction analysis"

Connected through hyperedge HE-4 (induced by source paper "differential positivity on compact sets"):
  with members:
    - "a differential lyapunov framework for contraction analysis"

Connected through hyperedge HE-5 (induced by source paper "differential analysis of nonlinear systems revisiting the pendulum example"):
  with members:
    - "on differentially dissipative dynamical systems"
    - "on differential passivity of physical systems"
    - "a differential lyapunov framework for contraction analysis"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.SY(Systems and Control)