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: "computational complexity of smooth differential equations"
  Abstract: The computational complexity of the solutions $h$ to the ordinary#N#differential equation $h(0)=0$, $h'(t) = g(t, h(t))$ under various assumptions#N#on the function $g$ has been investigated. Kawamura showed in 2010 that the#N#solution $h$ can be PSPACE-hard even if $g$ is assumed to be Lipschitz#N#continuous and polynomial-time computable. We place further requirements on the#N#smoothness of $g$ and obtain the following results: the solution $h$ can still#N#be PSPACE-hard if $g$ is assumed to be of class $C^1$; for each $k\ge2$, the#N#solution $h$ can be hard for the counting hierarchy even if $g$ is of class#N#$C^k$.

Connected through hyperedge HE-1 (induced by source paper "function spaces for second order polynomial time"):
  with members:
    - "on function spaces and polynomial time computability"
    - "towards synthetic descriptive set theory an instantiation with represented spaces"
    - "the degree structure of weihrauch reducibility"
    - "complexity theory for operators in analysis"
    - "parameterized uniform complexity in numerics from smooth to analytic from np hard to polytime"
    - "lipschitz continuous ordinary differential equations are polynomial space complete"

Connected through hyperedge HE-2 (induced by source paper "complexity theory for operators in analysis"):
  with members:
    - "zone diagrams in euclidean spaces and in other normed spaces"
    - "distance k sectors exist"
    - "lipschitz continuous ordinary differential equations are polynomial space complete"
    - "on the complexity of real functions"

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)