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: "information transmission using the nonlinear fourier transform part i mathematical tools"
  Abstract: The nonlinear Fourier transform (NFT), a powerful tool in soliton theory and exactly solvable models, is a method for solving integrable partial differential equations governing wave propagation in certain nonlinear media. The NFT decorrelates signal degrees-of-freedom in such models, in much the same way that the Fourier transform does for linear systems. In this three-part series of papers, this observation is exploited for data transmission over integrable channels, such as optical fibers, where pulse propagation is governed by the nonlinear Schrodinger equation. In this transmission scheme, which can be viewed as a nonlinear analogue of orthogonal frequency-division multiplexing commonly used in linear channels, information is encoded in the nonlinear frequencies and their spectral amplitudes. Unlike most other fiber-optic transmission schemes, this technique deals with both dispersion and nonlinearity directly and unconditionally without the need for dispersion or nonlinearity compensation methods. This paper explains the mathematical tools that underlie the method.

Connected through hyperedge HE-1 (induced by source paper "efficient nonlinear fourier transform algorithms of order four on equispaced grid"):
  with members:
    - "fast numerical nonlinear fourier transforms"

Connected through hyperedge HE-2 (induced by source paper "communication using eigenvalues of higher multiplicity of the nonlinear fourier transform"):
  with members:
    - "experimental demonstration of nonlinear frequency division multiplexed transmission"
    - "information transmission using the nonlinear fourier transform part iii spectrum modulation"

Connected through hyperedge HE-3 (induced by source paper "statistics of the eigenvalues of a noisy multi soliton pulse"):
  with members:
    - "information transmission using the nonlinear fourier transform part iii spectrum modulation"

Connected through hyperedge HE-4 (induced by source paper "an efficient nonlinear fourier transform algorithm for detection of eigenvalues from continuous spectrum"):
  with members:
    - "fast numerical nonlinear fourier transforms"

Connected through hyperedge HE-5 (induced by source paper "polarization division multiplexing based on the nonlinear fourier transform"):
  with members:
    - "signaling on the continuous spectrum of nonlinear optical fiber"
    - "why noise and dispersion may seriously hamper nonlinear frequency division multiplexing"
    - "demonstration of fully nonlinear spectrum modulated system in the highly nonlinear optical transmission regime"
    - "fast numerical nonlinear fourier transforms"
    - "information transmission using the nonlinear fourier transform part ii numerical methods"
    - "information transmission using the nonlinear fourier transform part iii spectrum modulation"

Connected through hyperedge HE-6 (induced by source paper "the kolmogorov zakharov model for optical fiber communication"):
  with members:
    - "nonlinear frequency division multiplexing"
    - "linear and nonlinear frequency division multiplexing"
    - "information transmission using the nonlinear fourier transform part ii numerical methods"

Connected through hyperedge HE-7 (induced by source paper "correlated eigenvalues optical communications"):
  with members:
    - "experimental demonstration of nonlinear frequency division multiplexed transmission"
    - "information transmission using the nonlinear fourier transform part ii numerical methods"
    - "information transmission using the nonlinear fourier transform part iii spectrum modulation"

Connected through hyperedge HE-8 (induced by source paper "signaling on the continuous spectrum of nonlinear optical fiber"):
  with members:
    - "fast numerical nonlinear fourier transforms"
    - "information transmission using the nonlinear fourier transform part ii numerical methods"
    - "information transmission using the nonlinear fourier transform part iii spectrum modulation"

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.IT(Information Theory)