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 characterising distributability"
  Abstract: We formalise a general concept of distributed systems as sequential compo- nents interacting asynchronously. We define a corresponding class of Petri nets, called LSGA nets, and precisely characterise those system specifications which can be imple- mented as LSGA nets up to branching ST-bisimilarity with explicit divergence.

Connected through hyperedge HE-1 (induced by source paper "ensuring liveness properties of distributed systems open problems"):
  with members:
    - "progress justness and fairness"
    - "reward testing equivalences for processes"
    - "justness a completeness criterion for capturing liveness properties"
    - "analysing mutual exclusion using process algebra with signals"
    - "lean and full congruence formats for recursion"
    - "structure preserving bisimilarity supporting an operational petri net semantics of ccsp"
    - "ccs it s not fair fair schedulers cannot be implemented in ccs like languages even under progress and certain fairness assumptions"
    - "progress fairness and justness in process algebra"

Connected through hyperedge HE-2 (induced by source paper "justness a completeness criterion for capturing liveness properties"):
  with members:
    - "progress justness and fairness"
    - "analysing mutual exclusion using process algebra with signals"
    - "ensuring liveness properties of distributed systems a research agenda"
    - "structure preserving bisimilarity supporting an operational petri net semantics of ccsp"
    - "progress fairness and justness in process algebra"
    - "a process algebra for wireless mesh networks"
    - "a process algebra for wireless mesh networks used for modelling verifying and analysing aodv"
    - "on synchronous and asynchronous interaction in distributed systems"

Connected through hyperedge HE-3 (induced by source paper "conflict vs causality in event structures"):
  with members:
    - "practical graph isomorphism ii"
    - "a logic for true concurrency"

Connected through hyperedge HE-4 (induced by source paper "ensuring liveness properties of distributed systems a research agenda"):
  with members:
    - "structure preserving bisimilarity supporting an operational petri net semantics of ccsp"
    - "automated analysis of aodv using uppaal"
    - "a process algebra for wireless mesh networks"
    - "a process algebra for wireless mesh networks used for modelling verifying and analysing aodv"
    - "sequence numbers do not guarantee loop freedom aodv can yield routing loops"
    - "psi calculi a framework for mobile processes with nominal data and logic"
    - "branching bisimilarity with explicit divergence"

Connected through hyperedge HE-5 (induced by source paper "concurrency and probability removing confusion compositionally"):
  with members:
    - "unifying inference for bayesian and petri nets"
    - "event structures for petri nets with persistence"
    - "connector algebras for c e and p t nets interactions"

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)