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: "on the necessity of symmetric positional coupling for string stability"
  Abstract: We consider a distributed system with identical agents, constant-spacing policy, and asymmetric bidirectional control, where the asymmetry is due to different controllers, which we describe by transfer functions. By applying the wave-transfer function approach, it is shown that if there are two integrators in the dynamics of agents, then the positional coupling must be symmetric; otherwise, the system is string unstable. The main advantage of the transfer function approach is that it allows us to analyze the bidirectional control with an arbitrary complex asymmetry in the controllers, for instance, the control with symmetric positional but asymmetric velocity couplings.

Connected through hyperedge HE-1 (induced by source paper "on mathcal l _ infty string stability of asymmetrically coupled bidirectional heterogeneous platoon systems"):
  with members:
    - "string stability and a delay based spacing policy for vehicle platoons subject to disturbances"
    - "disturbance scaling in bidirectional vehicle platoons with different asymmetry in position and velocity coupling"
    - "scaling in bidirectional platoons with dynamic controllers and proportional asymmetry"

Connected through hyperedge HE-2 (induced by source paper "disturbance scaling in bidirectional vehicle platoons with different asymmetry in position and velocity coupling"):
  with members:
    - "transients of platoons with asymmetric and different laplacians"
    - "nonzero bound on fiedler eigenvalue causes exponential growth of h infinity norm of vehicular platoon"
    - "scaling in bidirectional platoons with dynamic controllers and proportional asymmetry"

Connected through hyperedge HE-3 (induced by source paper "a travelling wave approach to a multi agent system with a path graph topology"):
  with members:
    - "nonzero bound on fiedler eigenvalue causes exponential growth of h infinity norm of vehicular platoon"
    - "wave absorbing vehicular platoon controller"

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)