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: "approximate sum capacity of the y channel"
  Abstract: A network where three users want to establish multiple unicasts between each other via a relay is considered. This network is called the Y-channel and resembles an elemental ingredient of future wireless networks. The sum-capacity of this network is studied. A characterization of the sum-capacity within an additive gap of 2 bits, and a multiplicative gap of 4, for all values of channel gains and transmit powers is obtained. Contrary to similar setups where the cut-set bounds can be achieved within a constant gap, they cannot be achieved in our case, where they are dominated by our new genie-aided bounds. Furthermore, it is shown that a time-sharing strategy, in which at each time two users exchange information using coding strategies of the bidirectional relay channel, achieves the upper bounds to within a constant gap. This result is further extended to the K-user case, where it is shown that the same scheme achieves the sum-capacity within 2log(K-1) bits.

Connected through hyperedge HE-1 (induced by source paper "optimal dof region for the asymmetric two pair mimo two way relay channel"):
  with members:
    - "optimal degrees of freedom region for the asymmetric mimo y channel"
    - "generalized signal alignment on the achievable dof for multi user mimo two way relay channels"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "generalized signal alignment for arbitrary mimo two way relay channels"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the degrees of freedom of the mimo y channel"

Connected through hyperedge HE-2 (induced by source paper "on the degrees of freedom of the symmetric multi relay mimo y channel"):
  with members:
    - "optimal degrees of freedom region for the asymmetric mimo y channel"
    - "generalized signal alignment on the achievable dof for multi user mimo two way relay channels"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the degrees of freedom of the mimo y channel"

Connected through hyperedge HE-3 (induced by source paper "three way channels with multiple unicast sessions capacity approximation via network transformation"):
  with members:
    - "device relaying in cellular d2d networks a fairness perspective"
    - "a survey on device to device communication in cellular networks"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "the degrees of freedom of multi way device to device communications is limited by 2"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the deterministic multicast capacity of 4 node relay networks"
    - "in band full duplex wireless challenges and opportunities"
    - "two way interference channels"

Connected through hyperedge HE-4 (induced by source paper "cyclic communication and the inseparability of mimo multi way relay channels"):
  with members:
    - "spectral and energy efficiency in 3 way relay channels with circular message exchanges"
    - "simultaneous diagonalization on the dof region of the k user mimo multi way relay channel"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the deterministic multicast capacity of 4 node relay networks"
    - "the degrees of freedom of the mimo y channel"
    - "optimal transmit power allocation for mimo two way cognitive relay networks with multiple relays"
    - "divide and conquer approaching the capacity of the two pair bidirectional gaussian relay network"

Connected through hyperedge HE-5 (induced by source paper "degrees of freedom of the symmetric multi relay mimo y channel"):
  with members:
    - "generalized signal alignment on the achievable dof for multi user mimo two way relay channels"
    - "cyclic communication and the inseparability of mimo multi way relay channels"
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"
    - "degrees of freedom for the mimo multi way relay channel"
    - "degrees of freedom for mimo two way x relay channel"
    - "multiple input multiple output two way relaying a space division approach"

Connected through hyperedge HE-6 (induced by source paper "simultaneous diagonalization on the dof region of the k user mimo multi way relay channel"):
  with members:
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the deterministic multicast capacity of 4 node relay networks"
    - "the degrees of freedom of the mimo y channel"
    - "optimal transmit power allocation for mimo two way cognitive relay networks with multiple relays"
    - "divide and conquer approaching the capacity of the two pair bidirectional gaussian relay network"
    - "on the equal rate capacity of the awgn multiway relay channel"
    - "signal space alignment for the gaussian y channel"

Connected through hyperedge HE-7 (induced by source paper "mimo multiway relaying with pairwise data exchange a degrees of freedom perspective"):
  with members:
    - "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"
    - "beyond one way communication degrees of freedom of multi way relay mimo interference networks"
    - "degrees of freedom for the mimo multi way relay channel"
    - "the degrees of freedom of the mimo y channel"
    - "multiple input multiple output two way relaying a space division approach"
    - "subspace alignment chains and the degrees of freedom of the three user mimo interference channel"
    - "optimal beamforming for two way multi antenna relay channel with analogue network coding"
    - "physical network coding in two way wireless relay channels"

Connected through hyperedge HE-8 (induced by source paper "mimo multiway relaying with clustered full data exchange signal space alignment and degrees of freedom"):
  with members:
    - "beamforming design for multiuser two way relaying a unified approach via max min sinr"
    - "degrees of freedom for the mimo multi way relay channel"
    - "degrees of freedom for mimo two way x relay channel"
    - "multiple input multiple output two way relaying a space division approach"
    - "the capacity region of multiway relay channels over finite fields with full data exchange"
    - "subspace alignment chains and the degrees of freedom of the three user mimo interference channel"
    - "physical network coding in two way wireless relay channels"

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)