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: "solving graph coloring problems with abstraction and symmetry"
  Abstract: This paper introduces a general methodology, based on abstraction#R##N#and symmetry, that applies to solve hard graph edge-coloring problems and demonstrates#R##N#its use to provide further evidence that the Ramsey number R(4; 3; 3) =#R##N#30. The number R(4; 3; 3) is often presented as the unknown Ramsey number#R##N#with the best chances of being found “soon”. Yet, its precise value has remained#R##N#unknown for more than 50 years. We illustrate our approach by showing that: (1)#R##N#there are precisely 78,892 (3; 3; 3; 13) Ramsey colorings; and (2) if there exists#R##N#a (4; 3; 3; 30) Ramsey coloring then it is (13,8,8) regular. Specifically each node#R##N#has 13 edges in the first color, 8 in the second, and 8 in the third. We conjecture#R##N#that these two results will help provide a proof that no (4; 3; 3; 30) Ramsey#R##N#coloring exists implying that R(4; 3; 3) = 30.

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.AI(Artificial Intelligence)