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: "observability and decentralized control of fuzzy discrete event systems"
  Abstract: Fuzzy discrete event systems as a generalization of (crisp) discrete event systems have been introduced in order that it is possible to effectively represent uncertainty, imprecision, and vagueness arising from the dynamic of systems. A fuzzy discrete event system has been modelled by a fuzzy automaton; its behavior is described in terms of the fuzzy language generated by the automaton. In this paper, we are concerned with the supervisory control problem for fuzzy discrete event systems with partial observation. Observability, normality, and co-observability of crisp languages are extended to fuzzy languages. It is shown that the observability, together with controllability, of the desired fuzzy language is a necessary and sufficient condition for the existence of a partially observable fuzzy supervisor. When a decentralized solution is desired, it is proved that there exist local fuzzy supervisors if and only if the fuzzy language to be synthesized is controllable and co-observable. Moreover, the infimal controllable and observable fuzzy superlanguage, and the supremal controllable and normal fuzzy sublanguage are also discussed. Simple examples are provided to illustrate the theoretical development.

Connected through hyperedge HE-1 (induced by source paper "supervisory control of fuzzy discrete event systems for simulation equivalence"):
  with members:
    - "computation of the greatest simulations and bisimulations between fuzzy automata"
    - "model checking of linear time properties based on possibility measure"
    - "bisimulations for fuzzy transition systems"
    - "state based control of fuzzy discrete event systems"
    - "fuzzy discrete event systems under fuzzy observability and a test algorithm"
    - "supervisory control of fuzzy discrete event systems a formal approach"
    - "supervisory control of fuzzy discrete event systems"

Connected through hyperedge HE-2 (induced by source paper "bifuzzy discrete event systems and their supervisory control theory"):
  with members:
    - "fuzzy discrete event systems under fuzzy observability and a test algorithm"
    - "supervisory control of fuzzy discrete event systems a formal approach"
    - "supervisory control of fuzzy discrete event systems"

Connected through hyperedge HE-3 (induced by source paper "further improvements of determinization methods for fuzzy finite automata"):
  with members:
    - "supervisory control of fuzzy discrete event systems for simulation equivalence"
    - "brzozowski type determinization for fuzzy automata"
    - "determinization of fuzzy automata by means of the degrees of language inclusion"
    - "a possibilistic model for qualitative sequential decision problems under uncertainty in partially observable environments"
    - "pomdps under probabilistic semantics"
    - "qualitative possibilistic mixed observable mdps"
    - "decidability of minimization of fuzzy automata"
    - "computation of the greatest simulations and bisimulations between fuzzy automata"

Connected through hyperedge HE-4 (induced by source paper "computation tree logic model checking based on possibility measures"):
  with members:
    - "model checking of linear time properties based on possibility measure"

Connected through hyperedge HE-5 (induced by source paper "computation of the greatest simulations and bisimulations between fuzzy automata"):
  with members:
    - "construction of fuzzy automata from fuzzy regular expressions"
    - "bisimulations for fuzzy transition systems"
    - "bisimulations for fuzzy automata"
    - "reduction of fuzzy automata by means of fuzzy quasi orders"
    - "simulation vs equivalence"
    - "state based control of fuzzy discrete event systems"
    - "generalizing the paige tarjan algorithm by abstract interpretation"
    - "fuzzy discrete event systems under fuzzy observability and a test algorithm"

Connected through hyperedge HE-6 (induced by source paper "model checking of linear time properties based on possibility measure"):
  with members:
    - "model checking of linear time properties in multi valued systems"

Connected through hyperedge HE-7 (induced by source paper "reduction of fuzzy automata by means of fuzzy quasi orders"):
  with members:
    - "state based control of fuzzy discrete event systems"
    - "generalizing the paige tarjan algorithm by abstract interpretation"
    - "fuzzy discrete event systems under fuzzy observability and a test algorithm"
    - "supervisory control of fuzzy discrete event systems a formal approach"
    - "supervisory control of fuzzy discrete event systems"

Connected through hyperedge HE-8 (induced by source paper "a fuzzy petri nets model for computing with words"):
  with members:
    - "probabilistic automata for computing with words"
    - "supervisory control of fuzzy discrete event systems a formal approach"
    - "supervisory control of fuzzy discrete event systems"

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.DM(Discrete Mathematics)