human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "branching bisimilarity of normed bpa processes is in nexptime"):
  Abstract: Branching bisimilarity on normed BPA processes was recently shown to be decidable by Yuxi Fu (ICALP 2013) but his proof has not provided any upper complexity bound. We present a simpler approach based on relative prime decompositions that leads to a nondeterministic exponential-time algorithm; this is close to the known exponential-time lower bound.

Includes members:
  Member "branching bisimilarity on normed bpa is exptime complete":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "branching bisimilarity of normed bpa processes as a rational monoid")
  Member "a polynomial time algorithm for deciding branching bisimilarity on totally normed bpa":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "branching bisimilarity of normed bpa processes as a rational monoid")
  Member "branching bisimilarity checking for prs":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "bisimulation equivalence of first order grammars is ackermann complete")
  Member "bisimilarity on basic process algebra is in 2 exptime an explicit proof":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "branching bisimilarity of normed bpa processes as a rational monoid")
  Member "bpa bisimilarity is exptime hard":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "bisimulation equivalence of first order grammars is ackermann complete")

Question: Please tell me which class the source paper 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)