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: "on the structure of classical realizability models of zf"
  Abstract: The technique of classical realizability is an extension of the method of forcing; it permits to extend the Curry-Howard correspondence between proofs and programs, to Zermelo-Fraenkel set theory and to build new models of ZF, called realizability models. The structure of these models is, in general, much more complicated than that of the particular case of forcing models.#R##N##R##N#We show here that the class of constructible sets of any realizability model is an elementary extension of the constructibles of the ground model (a trivial fact in the case of forcing, since these classes are identical).#R##N##R##N#By Shoenfield absoluteness theorem, it follows that every true Sigma^1_3 formula is realized by a closed lambda_c-term.

Connected through hyperedge HE-1 (induced by source paper "revisiting the duality of computation an algebraic analysis of classical realizability models"):
  with members:
    - "a sequent calculus with dependent types for classical arithmetic"
    - "bar recursion in classical realisability dependent choice and continuum hypothesis"
    - "realizability algebras a program to well order r"
    - "existential witness extraction in classical realizability and via a negative translation"

Connected through hyperedge HE-2 (induced by source paper "realizability interpretation and normalization of typed call by need lambda calculus with control"):
  with members:
    - "a classical realizability model for a semantical value restriction"
    - "classical realizability and arithmetical formul ae"
    - "the call by need lambda calculus revisited"
    - "existential witness extraction in classical realizability and via a negative translation"
    - "lazy evaluation and delimited control"

Connected through hyperedge HE-3 (induced by source paper "classical realizability as a classifier for nondeterminism"):
  with members:
    - "realizability algebras iii some examples"
    - "realizability algebras a program to well order r"

Connected through hyperedge HE-4 (induced by source paper "bar recursion in classical realisability dependent choice and continuum hypothesis"):
  with members:
    - "realizability algebras iii some examples"
    - "realizability algebras a program to well order r"

Connected through hyperedge HE-5 (induced by source paper "bar recursion in classical realisability dependent choice and well ordering of r"):
  with members:
    - "realizability algebras iii some examples"
    - "realizability algebras a program to well order r"

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.LO(Logic in Computer Science)