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: "report on article p np linear programming formulation of the traveling salesman problem"
  Abstract: This article presents counter examples for three articles claiming that P=NP. Articles for which it applies are: Moustapha Diaby "P = NP: Linear programming formulation of the traveling salesman problem" and "Equality of complexity classes P and NP: Linear programming formulation of the quadratic assignment problem", and also Sergey Gubin "A Polynomial Time Algorithm for The Traveling Salesman Problem"

Connected through hyperedge HE-1 (induced by source paper "report on article the travelling salesman problem a linear programming formulation"):
  with members:
    - "equality of complexity classes p and np linear programming formulation of the quadratic assignment problem"

Connected through hyperedge HE-2 (induced by source paper "a reply to hofman on why lp cannot solve large instances of np complete problems in polynomial time"):
  with members:
    - "equality of complexity classes p and np linear programming formulation of the quadratic assignment problem"

Connected through hyperedge HE-3 (induced by source paper "why linear programming cannot solve large instances of np complete problems in polynomial time"):
  with members:
    - "equality of complexity classes p and np linear programming formulation of the quadratic assignment problem"

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.CC(Computational Complexity)