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: "conditions for detectability in distributed consensus based observer networks"
  Abstract: This technical note discusses fundamental detectability properties associated with the problem of distributed state estimation using networked observers. The main result of the technical note establishes connections between detectability of the plant through measurements, observability of the node filters through interconnections, and algebraic properties of the underlying communication graph, to ensure the interconnected filtering error dynamics are stabilizable via output injection.

Connected through hyperedge HE-1 (induced by source paper "detection and mitigation of biasing attacks on distributed estimation networks"):
  with members:
    - "byzantine resilient distributed observers for lti systems"
    - "controller jammer game models of denial of service in control systems operating over packet dropping links"
    - "detection of biasing attacks on distributed estimation networks"
    - "distributed observers for lti systems"
    - "gain scheduled synchronization of parameter varying systems via relative h consensus with application to synchronization of uncertain bilinear systems"
    - "detectability of distributed consensus based observer networks an elementary analysis and extensions"
    - "on the genericity properties in distributed estimation topology design and sensor placement"

Connected through hyperedge HE-2 (induced by source paper "finite time distributed state estimation over time varying graphs exploiting the age of information"):
  with members:
    - "a distributed observer for a time invariant linear system"
    - "byzantine resilient distributed observers for lti systems"
    - "a hybrid observer for a distributed linear system with a changing neighbor graph"
    - "distributed observers for lti systems"
    - "a distributed algorithm for solving a linear algebraic equation"

Connected through hyperedge HE-3 (induced by source paper "resilient distributed h_ infty estimation via dynamic rejection of biasing attacks"):
  with members:
    - "detection of biasing attacks on distributed estimation networks"
    - "minimum energy distributed filtering"

Connected through hyperedge HE-4 (induced by source paper "distributed observers for lti systems"):
  with members:
    - "a distributed observer for a time invariant linear system"
    - "detectability of distributed consensus based observer networks an elementary analysis and extensions"
    - "distributed robust estimation over randomly switching networks using h consensus"
    - "distributing the kalman filter for large scale systems"

Connected through hyperedge HE-5 (induced by source paper "gain scheduled leader follower tracking control for interconnected parameter varying systems"):
  with members:
    - "gain scheduled synchronization of parameter varying systems via relative h consensus with application to synchronization of uncertain bilinear systems"
    - "guaranteed cost tracking for uncertain coupled multi agent systems using consensus over a directed graph"

Connected through hyperedge HE-6 (induced by source paper "graph theoretic distributed inference in social networks"):
  with members:
    - "on the genericity properties in distributed estimation topology design and sensor placement"
    - "a structured systems approach for optimal actuator sensor placement in linear time invariant systems"
    - "diffusion strategies outperform consensus strategies for distributed estimation over adaptive networks"
    - "opinion dynamics in social networks a local interaction game with stubborn agents"
    - "using a model of social dynamics to predict popularity of news"
    - "distributing the kalman filter for large scale systems"

Connected through hyperedge HE-7 (induced by source paper "minimum energy distributed filtering"):
  with members:
    - "distributed robust estimation over randomly switching networks using h consensus"

Connected through hyperedge HE-8 (induced by source paper "detectability of distributed consensus based observer networks an elementary analysis and extensions"):
  with members:
    - "distributed robust estimation over randomly switching networks using h consensus"

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)