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: "llull and copeland voting computationally resist bribery and control"
  Abstract: The only systems previously known to be resistant to all the standard control types were highly artificial election systems created by hybridization. We study a parameterized version of Copeland voting, denoted by Copeland^\alpha, where the parameter \alpha is a rational number between 0 and 1 that specifies how ties are valued in the pairwise comparisons of candidates. We prove that Copeland^{0.5}, the system commonly referred to as "Copeland voting," provides full resistance to constructive control, and we prove the same for Copeland^\alpha, for all rational \alpha, 0 < \alpha < 1. Copeland voting is the first natural election system proven to have full resistance to constructive control. We also prove that both Copeland^1 (Llull elections) and Copeland^0 are resistant to all standard types of constructive control other than one variant of addition of candidates. Moreover, we show that for each rational \alpha, 0 \leq \alpha \leq 1, Copeland^\alpha voting is fully resistant to bribery attacks, and we establish fixed-parameter tractability of bounded-case control for Copeland^\alpha. We also study Copeland^\alpha elections under more flexible models such as microbribery and extended control and we integrate the potential irrationality of voter preferences into many of our results.

Connected through hyperedge HE-1 (induced by source paper "achieving fully proportional representation is easy in practice"):
  with members:
    - "on the computation of fully proportional representation"
    - "fully proportional representation as resource allocation approximability results"
    - "where are the hard manipulation problems"

Connected through hyperedge HE-2 (induced by source paper "normalized range voting broadly resists control"):
  with members:
    - "how many vote operations are needed to manipulate a voting system"
    - "a smooth transition from powerlessness to absolute power"
    - "complexity of and algorithms for borda manipulation"
    - "bucklin voting is broadly resistant to control"
    - "control complexity in fallback voting"
    - "where are the hard manipulation problems"
    - "the shield that never was societies with single peaked preferences are more open to manipulation and control"
    - "sincere strategy preference based approval voting fully resists constructive control and broadly resists destructive control"

Connected through hyperedge HE-3 (induced by source paper "the complexity of probabilistic lobbying"):
  with members:
    - "manipulation of nanson s and baldwin s rules"
    - "complexity of and algorithms for borda manipulation"
    - "parameterizing by the number of numbers"
    - "control complexity in fallback voting"
    - "the shield that never was societies with single peaked preferences are more open to manipulation and control"
    - "sincere strategy preference based approval voting fully resists constructive control and broadly resists destructive control"
    - "satzilla portfolio based algorithm selection for sat"
    - "on approximating optimal weighted lobbying and frequency of correctness versus average case polynomial time"

Connected through hyperedge HE-4 (induced by source paper "sincere strategy preference based approval voting fully resists constructive control and broadly resists destructive control"):
  with members:
    - "on approximating optimal weighted lobbying and frequency of correctness versus average case polynomial time"
    - "the strategy proofness landscape of merging"
    - "copeland voting fully resists constructive control"
    - "hybrid elections broaden complexity theoretic resistance to control"
    - "a richer understanding of the complexity of election systems"
    - "anyone but him the complexity of precluding an alternative"
    - "guarantees for the success frequency of an algorithm for finding dodgson election winners"

Connected through hyperedge HE-5 (induced by source paper "copeland voting fully resists constructive control"):
  with members:
    - "frequency of correctness versus average case polynomial time and generalized juntas"
    - "hybrid elections broaden complexity theoretic resistance to control"
    - "anyone but him the complexity of precluding an alternative"
    - "guarantees for the success frequency of an algorithm for finding dodgson election winners"

Connected through hyperedge HE-6 (induced by source paper "hybrid elections broaden complexity theoretic resistance to control"):
  with members:
    - "sincere strategy preference based approval voting fully resists constructive control and broadly resists destructive control"
    - "copeland voting fully resists constructive control"
    - "a richer understanding of the complexity of election systems"
    - "anyone but him the complexity of precluding an alternative"
    - "guarantees for the success frequency of an algorithm for finding dodgson election winners"
    - "universal voting protocol tweaks to make manipulation hard"
    - "how many candidates are needed to make elections hard to manipulate"
    - "complexity of manipulating elections with few candidates"

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.GT(Computer Science and Game Theory)