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: "equality of complexity classes p and np linear programming formulation of the quadratic assignment problem"
  Abstract: In this paper, we present a polynomial-sized linear programming formulation of the Quadratic Assignment Problem (QAP). The proposed linear program is a network flow-based model. Hence, it provides for the solution of the QAP in polynomial time. Computational testing and results are discussed.

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

Connected through hyperedge HE-2 (induced by source paper "a o n 8 x o n 7 linear programming model of the quadratic assignment problem"):
  with members:
    - "the traveling salesman problem a linear programming formulation of"

Connected through hyperedge HE-3 (induced by source paper "a reply to hofman on why lp cannot solve large instances of np complete problems in polynomial time"):
  with members:
    - "report on article p np linear programming formulation of the traveling salesman problem"

Connected through hyperedge HE-4 (induced by source paper "why linear programming cannot solve large instances of np complete problems in polynomial time"):
  with members:
    - "report on article p np linear programming formulation of the traveling salesman 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)