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 thin air reads towards an event structures model of relaxed memory"
  Abstract: To model relaxed memory, we propose confusion-free event structures over an alphabet with a justification relation. Executions are modeled by justified configurations, where every read event has a justifying write event. Justification alone is too weak a criterion, since it allows cycles of the kind that result in so-called thin-air reads. Acyclic justification forbids such cycles, but also invalidates event reorderings that result from compiler optimizations and dynamic instruction scheduling. We propose the notion of well-justification, based on a game-like model, which strikes a middle ground. #R##N#We show that well-justified configurations satisfy the DRF theorem: in any data-race free program, all well-justified configurations are sequentially consistent. We also show that rely-guarantee reasoning is sound for well-justified configurations, but not for justified configurations. For example, well-justified configurations are type-safe. #R##N#Well-justification allows many, but not all reorderings performed by relaxed memory. In particular, it fails to validate the commutation of independent reads. We discuss variations that may address these shortcomings.

Connected through hyperedge HE-1 (induced by source paper "pridemm a solver for relaxed memory models"):
  with members:
    - "an achilles heel of term resolution"
    - "on the quest for an acyclic graph"
    - "overhauling sc atomics in c11 and opencl"
    - "syntax and analytic semantics of lisa"
    - "q resolution with generalized axioms"
    - "ic3 modulo theories via implicit predicate abstraction"
    - "herding cats modelling simulation testing and data mining for weak memory"

Connected through hyperedge HE-2 (induced by source paper "bridging the gap between programming languages and hardware weak memory models"):
  with members:
    - "constructing a weak memory model"
    - "the semantics of transactions and weak memory in x86 power arm and c"
    - "counterexamples and proof loophole for the c c to power and armv7 trailing sync compiler mappings"
    - "herding cats modelling simulation testing and data mining for weak memory"

Connected through hyperedge HE-3 (induced by source paper "reconciling event structures with modern multiprocessors"):
  with members:
    - "bridging the gap between programming languages and hardware weak memory models"
    - "operational aspects of c c concurrency"
    - "herding cats modelling simulation testing and data mining for weak memory"

Connected through hyperedge HE-4 (induced by source paper "minimisation of event structures"):
  with members:
    - "reduction of event structures under history preserving bisimulation"
    - "configuration structures event structures and petri nets"

Connected through hyperedge HE-5 (induced by source paper "a denotational account of c11 style memory"):
  with members:
    - "a denotational semantics for sparc tso"
    - "overhauling sc atomics in c11 and opencl"

Connected through hyperedge HE-6 (induced by source paper "compositional verification of compiler optimisations on relaxed memory"):
  with members:
    - "herding cats modelling simulation testing and data mining for weak memory"

Connected through hyperedge HE-7 (induced by source paper "domains and event structures for fusions"):
  with members:
    - "configuration structures event structures and petri nets"

Connected through hyperedge HE-8 (induced by source paper "a denotational semantics for sparc tso"):
  with members:
    - "herding cats modelling simulation testing and data mining for weak memory"

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.PL(Programming Languages)