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: "a classical realizability model for a semantical value restriction"
  Abstract: We present a new type system with support for proofs of programs in a call-by-value language with control operators. The proof mechanism relies on observational equivalence of untyped programs. It appears in two type constructors, which are used for specifying program properties and for encoding dependent products.The main challenge arises from the lack of expressiveness of dependent products due to the value restriction. To circumvent this limitation we relax the syntactic restriction and only require equivalence to a value.The consistency of the system is obtained semantically by constructing a classical realizability model in three layers values, stacks and terms.

Connected through hyperedge HE-1 (induced by source paper "a constructive proof of dependent choice in classical arithmetic via memoization"):
  with members:
    - "a sequent calculus with dependent types for classical arithmetic"
    - "an interpretation of system f through bar recursion"
    - "classical realizability as a classifier for nondeterminism"
    - "realizability algebras iii some examples"
    - "bar recursion in classical realisability dependent choice and continuum hypothesis"
    - "bar recursion and products of selection functions"
    - "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 "pml 2 integrated program verification in ml"):
  with members:
    - "semi continuous sized types and termination"

Connected through hyperedge HE-3 (induced by source paper "realizability interpretation and normalization of typed call by need lambda calculus with control"):
  with members:
    - "on the structure of classical realizability models of zf"
    - "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-4 (induced by source paper "a sequent calculus with dependent types for classical arithmetic"):
  with members:
    - "realizability interpretation and normalization of typed call by need lambda calculus with control"
    - "an interpretation of system f through bar recursion"
    - "bar recursion in classical realisability dependent choice and continuum hypothesis"
    - "bar recursion and products of selection functions"

Connected through hyperedge HE-5 (induced by source paper "practical subtyping for system f with sized co induction"):
  with members:
    - "the size change termination principle for constructor based languages"
    - "on the relation between size based termination and semantic labelling"
    - "semi continuous sized types and termination"
    - "decidability of type checking in the calculus of algebraic constructions with size annotations"

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)