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: "buchi complementation and size change termination"
  Abstract: We compare tools for complementing nondeterministic B\"uchi automata with a#N#recent termination-analysis algorithm. Complementation of B\"uchi automata is a#N#key step in program verification. Early constructions using a Ramsey-based#N#argument have been supplanted by rank-based constructions with exponentially#N#better bounds. In 2001 Lee et al. presented the size-change termination (SCT)#N#problem, along with both a reduction to B\"uchi automata and a Ramsey-based#N#algorithm. The Ramsey-based algorithm was presented as a more practical#N#alternative to the automata-theoretic approach, but strongly resembles the#N#initial complementation constructions for B\"uchi automata. We prove that the#N#SCT algorithm is a specialized realization of the Ramsey-based complementation#N#construction. To do so, we extend the Ramsey-based complementation construction#N#to provide a containment-testing algorithm. Surprisingly, empirical analysis#N#suggests that despite the massive gap in worst-case complexity, Ramsey-based#N#approaches are superior over the domain of SCT problems. Upon further analysis#N#we discover an interesting property of the problem space that both explains#N#this result and provides a chance to improve rank-based tools. With these#N#improvements, we show that theoretical gains in efficiency of the rank-based#N#approach are mirrored in empirical performance.

Connected through hyperedge HE-1 (induced by source paper "simulations in rank based b uchi automata complementation technical report"):
  with members:
    - "foundation for a series of efficient simulation algorithms"
    - "efficient reduction of nondeterministic automata with application to language inclusion testing"
    - "termination analysis by learning terminating programs"
    - "unifying buchi complementation constructions"
    - "an efficient simulation algorithm based on abstract interpretation"

Connected through hyperedge HE-2 (induced by source paper "efficient reduction of nondeterministic automata with application to language inclusion testing"):
  with members:
    - "reduction of nondeterministic tree automata"
    - "what are strategies in delay games borel determinacy for games with lookahead"
    - "buffered simulation games for buchi automata"
    - "advanced automata minimization"
    - "degrees of lookahead in regular infinite games"

Connected through hyperedge HE-3 (induced by source paper "state of buchi complementation"):
  with members:
    - "b uchi complementation made tight"
    - "antichains for the automata based approach to model checking"
    - "enriched mu calculi module checking"
    - "lower bounds for complementation of omega automata via the full automata technique"
    - "from nondeterministic b uchi and streett automata to deterministic parity automata"
    - "decisive markov chains"

Connected through hyperedge HE-4 (induced by source paper "termination analysis by learning terminating programs"):
  with members:
    - "ranking templates for linear loops"
    - "state of buchi complementation"
    - "linear ranking for linear lasso programs"
    - "proving termination starting from the end"
    - "size change termination monotonicity constraints and ranking functions"

Connected through hyperedge HE-5 (induced by source paper "buffered simulation games for buchi automata"):
  with members:
    - "advanced automata minimization"
    - "degrees of lookahead in regular infinite games"
    - "antichains for the automata based approach to model checking"

Connected through hyperedge HE-6 (induced by source paper "advanced automata minimization"):
  with members:
    - "b uchi automata can have smaller quotients"
    - "from nondeterministic b uchi and streett automata to deterministic parity automata"

Connected through hyperedge HE-7 (induced by source paper "monotonicity constraints for termination in the integer domain"):
  with members:
    - "size change termination monotonicity constraints and ranking functions"
    - "ranking functions for size change termination ii"
    - "heap reference analysis using access graphs"
    - "a general framework for automatic termination analysis of logic programs"

Connected through hyperedge HE-8 (induced by source paper "size change termination monotonicity constraints and ranking functions"):
  with members:
    - "ranking functions for size change termination ii"
    - "a general framework for automatic termination analysis of logic programs"

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.FL(Formal Languages and Automata Theory)