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 a characterization of cellular automata in tilings of the hyperbolic plane"
  Abstract: In this paper, we look at the extention of Hedlund's characterization of cellular automata to the case of cellular automata in the hyperbolic plane. This requires an additionnal condition. The new theorem is proved with full details in the case of the pentagrid and in the case of the ternary heptagrid and enough indications to show that it holds also on the grids $\{p,q\}$ of the hyperbolic plane.

Connected through hyperedge HE-1 (induced by source paper "a family of weakly universal cellular automata in the hyperbolic plane with two states"):
  with members:
    - "a new weakly universal cellular automaton in the 3d hyperbolic space with two states"
    - "the domino problem of the hyperbolic plane is undecidable"
    - "the domino problem of the hyperbolic plane is undecidable"

Connected through hyperedge HE-2 (induced by source paper "on the injectivity of the global function of a cellular automaton in the hyperbolic plane extended abstract"):
  with members:
    - "the injectivity of the global function of a cellular automaton in the hyperbolic plane is undecidable"
    - "the domino problem of the hyperbolic plane is undecidable"
    - "the domino problem of the hyperbolic plane is undecidable"
    - "constructing a uniform plane filling path in the ternary heptagrid of the hyperbolic plane"

Connected through hyperedge HE-3 (induced by source paper "the injectivity of the global function of a cellular automaton in the hyperbolic plane is undecidable"):
  with members:
    - "about the domino problem in the hyperbolic plane from an algorithmic point of view"
    - "the domino problem of the hyperbolic plane is undecidable"
    - "the domino problem of the hyperbolic plane is undecidable"
    - "constructing a uniform plane filling path in the ternary heptagrid of the hyperbolic plane"
    - "about the domino problem in the hyperbolic plane a new solution"

Connected through hyperedge HE-4 (induced by source paper "the finite tiling problem is undecidable in the hyperbolic plane"):
  with members:
    - "about the domino problem in the hyperbolic plane from an algorithmic point of view"
    - "about the domino problem in the hyperbolic plane a new solution"

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)