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: "orbits of linear maps and regular languages"
  Abstract: We settle the equivalence between the problem of hitting a polyhedral set by the orbit of a linear map and the intersection of a regular language and a language of permutations of binary words (the permutation filter realizability problem). The decidability of the both problems is presently unknown and the first one is a straightforward generalization of the famous Skolem problem and the nonnegativity problem in the theory of linear recurrent sequences. To show a `borderline' status of the permutation filter realizability problem with respect to computability we present some decidable and undecidable problems closely related to it.

Connected through hyperedge HE-1 (induced by source paper "the polyhedron hitting problem"):
  with members:
    - "on termination of integer linear loops"
    - "on the complexity of the orbit problem"
    - "positivity problems for low order linear recurrence sequences"
    - "ranking functions for linear constraint loops"

Connected through hyperedge HE-2 (induced by source paper "on the positivity problem for simple linear recurrence sequences"):
  with members:
    - "ultimate positivity is decidable for simple linear recurrence sequences"
    - "positivity problems for low order linear recurrence sequences"

Connected through hyperedge HE-3 (induced by source paper "ultimate positivity is decidable for simple linear recurrence sequences"):
  with members:
    - "on the positivity problem for simple linear recurrence sequences"
    - "positivity problems for low order linear recurrence sequences"

Connected through hyperedge HE-4 (induced by source paper "on the complexity of the orbit problem"):
  with members:
    - "the polyhedron hitting problem"

Connected through hyperedge HE-5 (induced by source paper "positivity problems for low order linear recurrence sequences"):
  with members:
    - "deciding conditional termination"

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.FL(Formal Languages and Automata Theory)