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: "computing higher homotopy groups is w 1 hard"
  Abstract: Recently it was shown that, for every fixed k>1, given a finite simply connected simplicial complex X, the kth homotopy group \pi_k(X) can be computed in time polynomial in the number n of simplices of X. We prove that this problem is W[1]-hard w.r.t. the parameter k even for X of dimension 4, and thus very unlikely to admit an algorithm with running time bound f(k)n^C for an absolute constant C. We also simplify, by about 20 pages, a 1989 proof by Anick that, with k part of input, the computation of the rank of \pi_k(X) is #P-hard.

Connected through hyperedge HE-1 (induced by source paper "computing simplicial representatives of homotopy group elements"):
  with members:
    - "computing all maps into a sphere"
    - "computing spectral sequences"

Connected through hyperedge HE-2 (induced by source paper "polynomial time computation of homotopy groups and postnikov systems in fixed dimension"):
  with members:
    - "extendability of continuous maps is undecidable"
    - "polynomial time homology for simplicial eilenberg maclane spaces"
    - "computing all maps into a sphere"
    - "complexity and algorithms for euler characteristic of simplicial complexes"
    - "computing spectral sequences"

Connected through hyperedge HE-3 (induced by source paper "computing all maps into a sphere"):
  with members:
    - "robust satisfiability of systems of equations"
    - "polynomial time computation of homotopy groups and postnikov systems in fixed dimension"
    - "computing spectral sequences"

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)