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: "branching bisimilarity checking for prs"
  Abstract: Recent studies reveal that branching bisimilarity is decidable for both nBPP (normed Basic Parallel Process) and nBPA (normed Basic Process Algebra). These results lead to the question if there are any other models in the hierarchy of PRS (Process Rewrite System) whose branching bisimilarity is decidable. It is shown in this paper that the branching bisimilarity for both nOCN (normed One Counter Net) and nPA (normed Process Algebra) is undecidable. These results essentially imply that the question has a negative answer.

Connected through hyperedge HE-1 (induced by source paper "bisimulation equivalence of first order grammars is ackermann complete"):
  with members:
    - "equivalence of pushdown automata via first order grammars"
    - "complexity hierarchies beyond elementary"
    - "bisimulation equivalence of first order grammars"
    - "complexity bounds for ordinal based termination"
    - "bpa bisimilarity is exptime hard"
    - "beyond language equivalence on visibly pushdown automata"
    - "the bisimulation problem for equational graphs of finite out degree"

Connected through hyperedge HE-2 (induced by source paper "games for bisimulations and abstraction"):
  with members:
    - "parity game reductions"
    - "computation tree logic with deadlock detection"
    - "branching bisimilarity with explicit divergence"

Connected through hyperedge HE-3 (induced by source paper "branching bisimilarity of normed bpa processes as a rational monoid"):
  with members:
    - "two lower bounds for bpa"
    - "branching bisimilarity on normed bpa is exptime complete"
    - "a polynomial time algorithm for deciding branching bisimilarity on totally normed bpa"
    - "branching bisimilarity of normed bpa processes is in nexptime"
    - "bisimilarity on basic process algebra is in 2 exptime an explicit proof"
    - "bpa bisimilarity is exptime hard"

Connected through hyperedge HE-4 (induced by source paper "parity game reductions"):
  with members:
    - "an o m log n algorithm for stuttering equivalence and branching bisimulation"
    - "benchmarks for parity games"
    - "advanced automata minimization"

Connected through hyperedge HE-5 (induced by source paper "branching bisimilarity on normed bpa is exptime complete"):
  with members:
    - "dividing line between decidable pda s and undecidable ones"
    - "a polynomial time algorithm for deciding branching bisimilarity on totally normed bpa"
    - "branching bisimilarity of normed bpa processes is in nexptime"
    - "bisimilarity on basic process algebra is in 2 exptime an explicit proof"
    - "bpa bisimilarity is exptime hard"
    - "equivalence checking on infinite state systems techniques and results"

Connected through hyperedge HE-6 (induced by source paper "bisimulation equivalence of first order grammars"):
  with members:
    - "complexity hierarchies beyond elementary"
    - "dividing line between decidable pda s and undecidable ones"
    - "bisimilarity on basic process algebra is in 2 exptime an explicit proof"
    - "bpa bisimilarity is exptime hard"
    - "on the complexity of the equivalence problem for probabilistic automata"
    - "the bisimulation problem for equational graphs of finite out degree"

Connected through hyperedge HE-7 (induced by source paper "branching bisimilarity of normed bpa processes is in nexptime"):
  with members:
    - "branching bisimilarity on normed bpa is exptime complete"
    - "a polynomial time algorithm for deciding branching bisimilarity on totally normed bpa"
    - "bisimilarity on basic process algebra is in 2 exptime an explicit proof"
    - "bpa bisimilarity is exptime hard"

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)