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: "paxos made epr decidable reasoning about distributed protocols"
  Abstract: Distributed protocols such as Paxos play an important role in many computer systems. Therefore, a bug in a distributed protocol may have tremendous effects. Accordingly, a lot of effort has been invested in verifying such protocols. However, checking invariants of such protocols is undecidable and hard in practice, as it requires reasoning about an unbounded number of nodes and messages. Moreover, protocol actions and invariants involve both quantifier alternations and higher-order concepts such as set cardinalities and arithmetic. #R##N#This paper makes a step towards automatic verification of such protocols. We aim at a technique that can verify correct protocols and identify bugs in incorrect protocols. To this end, we develop a methodology for deductive verification based on effectively propositional logic (EPR)---a decidable fragment of first-order logic (also known as the Bernays-Sch\"onfinkel-Ramsey class). In addition to decidability, EPR also enjoys the finite model property, allowing to display violations as finite structures which are intuitive for users. Our methodology involves modeling protocols using general (uninterpreted) first-order logic, and then systematically transforming the model to obtain a model and an inductive invariant that are decidable to check. The steps of the transformations are also mechanically checked, ensuring the soundness of the method. We have used our methodology to verify the safety of Paxos, and several of its variants, including Multi-Paxos, Vertical Paxos, Fast Paxos, Flexible Paxos and Stoppable Paxos. To the best of our knowledge, this work is the first to verify these protocols using a decidable logic, and the first formal verification of Vertical Paxos, Fast Paxos and Stoppable Paxos.

Connected through hyperedge HE-1 (induced by source paper "what s live understanding distributed consensus"):
  with members:
    - "moderately complex paxos made simple high level executable specification of distributed algorithms"
    - "paxos consensus deconstructed and abstracted extended version"
    - "from clarity to efficiency for distributed algorithms"
    - "vive la difference paxos vs viewstamped replication vs zab"

Connected through hyperedge HE-2 (induced by source paper "moderately complex paxos made simple high level executable specification of distributed algorithms"):
  with members:
    - "simpler specifications and easier proofs of distributed algorithms using history variables"
    - "formal verification of multi paxos for distributed consensus"
    - "from clarity to efficiency for distributed algorithms"
    - "vive la difference paxos vs viewstamped replication vs zab"

Connected through hyperedge HE-3 (induced by source paper "what s decidable about program verification modulo axioms"):
  with members:
    - "deciding memory safety for forest datastructures"
    - "decidable verification of uninterpreted programs"
    - "algorithms for algebraic path properties in concurrent systems of constant treewidth components"

Connected through hyperedge HE-4 (induced by source paper "inferring inductive invariants from phase structures"):
  with members:
    - "bounded quantifier instantiation for checking inductive invariants"
    - "a theory of formal synthesis via inductive learning"
    - "predicate abstraction with indexed predicates"

Connected through hyperedge HE-5 (induced by source paper "verification of threshold based distributed algorithms by decomposition to decidable logics"):
  with members:
    - "a short counterexample property for safety and liveness verification of fault tolerant distributed algorithms"
    - "revisiting fast practical byzantine fault tolerance"
    - "from clarity to efficiency for distributed algorithms"

Connected through hyperedge HE-6 (induced by source paper "how to win first order safety games"):
  with members:
    - "evolving algebras 1993 lipari guide"
    - "verifying security policies in multi agent workflows with loops"

Connected through hyperedge HE-7 (induced by source paper "certifying safety when implementing consensus"):
  with members:
    - "the power of distributed verifiers in interactive proofs"

Connected through hyperedge HE-8 (induced by source paper "simpler specifications and easier proofs of distributed algorithms using history variables"):
  with members:
    - "auxiliary variables in tla"
    - "formal verification of multi paxos for distributed consensus"
    - "demand driven incremental object queries"
    - "from clarity to efficiency for distributed algorithms"
    - "a tla proof system"

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)