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: "b uchi complementation made tight"
  Abstract: The precise complexity of complementing B\"uchi automata is an intriguing and long standing problem. While optimal complementation techniques for finite automata are simple - it suffices to determinize them using a simple subset construction and to dualize the acceptance condition of the resulting automaton - B\"uchi complementation is more involved. Indeed, the construction of an EXPTIME complementation procedure took a quarter of a century from the introduction of B\"uchi automata in the early 60s, and stepwise narrowing the gap between the upper and lower bound to a simple exponent (of (6e)n for B\"uchi automata with n states) took four decades. While the distance between the known upper (O'(0.96 n)n') and lower ('(0.76 n)n') bound on the required number of states has meanwhile been significantly reduced, an exponential factor remains between them. Also, the upper bound on the size of the complement automaton is not linear in the bound of its state space. These gaps are unsatisfactory from a theoretical point of view, but also because B\"uchi complementation is a useful tool in formal verification, in particular for the language containment problem. This paper proposes a B\"uchi complementation algorithm whose complexity meets, modulo a quadratic (O(n2)) factor, the known lower bound for B\"uchi complementation. It thus improves over previous constructions by an exponential factor and concludes the quest for optimal B\"uchi complementation algorithms.

Connected through hyperedge HE-1 (induced by source paper "state of buchi complementation"):
  with members:
    - "buchi complementation and size change termination"
    - "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-2 (induced by source paper "tight bounds for complementing parity automata"):
  with members:
    - "determinising parity automata"
    - "a tight lower bound for streett complementation"
    - "tight upper bounds for streett and parity complementation"
    - "lower bounds for complementation of omega automata via the full automata technique"

Connected through hyperedge HE-3 (induced by source paper "determinising parity automata"):
  with members:
    - "tight upper bounds for streett and parity complementation"
    - "lower bounds for complementation of omega automata via the full automata technique"

Connected through hyperedge HE-4 (induced by source paper "profile trees for buchi word automata with application to determinization"):
  with members:
    - "state of buchi complementation"
    - "unifying buchi complementation constructions"
    - "deterministic automata for the f g fragment of ltl"
    - "from nondeterministic b uchi and streett automata to deterministic parity automata"

Connected through hyperedge HE-5 (induced by source paper "buchi complementation and size change termination"):
  with members:
    - "sat based termination analysis using monotonicity constraints over the integers"
    - "size change termination monotonicity constraints and ranking functions"
    - "antichains for the automata based approach to model checking"

Connected through hyperedge HE-6 (induced by source paper "can nondeterminism help complementation"):
  with members:
    - "a tight lower bound for streett complementation"
    - "tight upper bounds for streett and parity complementation"
    - "from nondeterministic b uchi and streett automata to deterministic parity automata"

Connected through hyperedge HE-7 (induced by source paper "tight upper bounds for streett and parity complementation"):
  with members:
    - "a tight lower bound for streett complementation"
    - "from nondeterministic b uchi and streett automata to deterministic parity automata"

Connected through hyperedge HE-8 (induced by source paper "a tight lower bound for streett complementation"):
  with members:
    - "tight upper bounds for streett and parity complementation"

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)