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: "universal trees grow inside separating automata quasi polynomial lower bounds for parity games"
  Abstract: Several distinct techniques have been proposed to design quasi-polynomial algorithms for solving parity games since the breakthrough result of Calude, Jain, Khoussainov, Li, and Stephan (2017): play summaries, progress measures and register games. We argue that all those techniques can be viewed as instances of the separation approach to solving parity games, a key technical component of which is constructing (explicitly or implicitly) an automaton that separates languages of words encoding plays that are (decisively) won by either of the two players. Our main technical result is a quasi-polynomial lower bound on the size of such separating automata that nearly matches the current best upper bounds. This forms a barrier that all existing approaches must overcome in the ongoing quest for a polynomial-time algorithm for solving parity games. The key and fundamental concept that we introduce and study is a universal ordered tree. The technical highlights are a quasi-polynomial lower bound on the size of universal ordered trees and a proof that every separating safety automaton has a universal tree hidden in its state space.

Connected through hyperedge HE-1 (induced by source paper "the strahler number of a parity game"):
  with members:
    - "a universal attractor decomposition algorithm for parity games"
    - "parity games another view on lehtinen s algorithm"
    - "alternating weak automata from universal trees"
    - "computing nested fixpoints in quasipolynomial time"
    - "parity games zielonka s algorithm in quasi polynomial time"
    - "succinct progress measures for solving parity games"
    - "exponential lower bounds for policy iteration"

Connected through hyperedge HE-2 (induced by source paper "life is random time is not markov decision processes with window objectives"):
  with members:
    - "multi weighted markov decision processes with reachability objectives"
    - "expected window mean payoff"
    - "the complexity of mean payoff games using universal graphs"
    - "extending finite memory determinacy by boolean combination of winning conditions"
    - "value iteration for long run average reward in markov decision processes"
    - "threshold constraints with guarantees for parity objectives in markov decision processes"
    - "a storm is coming a modern probabilistic model checker"
    - "window parity games an alternative approach toward parity games with time bounds"

Connected through hyperedge HE-3 (induced by source paper "computing nested fixpoints in quasipolynomial time"):
  with members:
    - "parity games zielonka s algorithm in quasi polynomial time"
    - "succinct progress measures for solving parity games"
    - "monadic second order logic and bisimulation invariance for coalgebras"
    - "the fixpoint iteration algorithm for parity games"
    - "exptime tableaux for the coalgebraic mu calculus"
    - "completeness of flat coalgebraic fixpoint logics"

Connected through hyperedge HE-4 (induced by source paper "parity games zielonka s algorithm in quasi polynomial time"):
  with members:
    - "oink an implementation and evaluation of modern parity game solvers"
    - "robust exponential worst cases for divide et impera algorithms for parity games"
    - "efficient parallel strategy improvement for parity games"
    - "a short proof of correctness of the quasi polynomial time algorithm for parity games"
    - "an ordered approach to solving parity games in quasi polynomial time and quasi linear space"
    - "exponential lower bounds for policy iteration"

Connected through hyperedge HE-5 (induced by source paper "alternating weak automata from universal trees"):
  with members:
    - "a pseudo quasi polynomial algorithm for solving mean payoff parity games"
    - "parity games and universal graphs"
    - "an ordered approach to solving parity games in quasi polynomial time and quasi linear space"
    - "succinct progress measures for solving parity games"
    - "lower bounds for complementation of omega automata via the full automata technique"

Connected through hyperedge HE-6 (induced by source paper "parity games another view on lehtinen s algorithm"):
  with members:
    - "a short proof of correctness of the quasi polynomial time algorithm for parity games"
    - "an ordered approach to solving parity games in quasi polynomial time and quasi linear space"
    - "playing pushdown parity games in a hurry"
    - "exponential lower bounds for policy iteration"

Connected through hyperedge HE-7 (induced by source paper "improving the complexity of parys recursive algorithm"):
  with members:
    - "parity games zielonka s algorithm in quasi polynomial time"
    - "the complexity of mean payoff games using universal graphs"
    - "an ordered approach to solving parity games in quasi polynomial time and quasi linear space"
    - "succinct progress measures for solving parity games"

Connected through hyperedge HE-8 (induced by source paper "register games"):
  with members:
    - "alternating weak automata from universal trees"
    - "robust exponential worst cases for divide et impera algorithms for parity games"
    - "succinct progress measures for solving parity games"
    - "taming past ltl and flat counter systems"

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)