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: "alternating weak automata from universal trees"
  Abstract: An improved translation from alternating parity automata on infinite words to alternating weak automata is given. The blow-up of the number of states is related to the size of the smallest universal ordered trees and hence it is quasi-polynomial, and only polynomial if the asymptotic number of priorities is logarithmic in the number of states. #R##N#This is an exponential improvement on the translation of Kupferman and Vardi (2001) and a quasi-polynomial improvement on the translation of Boker and Lehtinen (2018). Any slightly better such translation would (if---like all presently known such translations---it is efficiently constructive) lead to algorithms for solving parity games that are asymptotically faster in the worst case than the current state of the art (Calude, Jain, Khoussainov, Li, and Stephan, 2017; Jurdzinski and Lazic, 2017; and Fearnley, Jain, Schewe, Stephan, and Wojtczak, 2017), and hence it would yield a significant breakthrough.

Connected through hyperedge HE-1 (induced by source paper "a universal attractor decomposition algorithm for parity games"):
  with members:
    - "practical synthesis of reactive systems from ltl specifications via parity games"
    - "improving the complexity of parys recursive algorithm"
    - "computing nested fixpoints in quasipolynomial time"
    - "parity games zielonka s algorithm in quasi polynomial time"
    - "fixpoint games on continuous lattices"
    - "quasipolynomial set based symbolic algorithms for parity games"
    - "oink an implementation and evaluation of modern parity game solvers"
    - "succinct progress measures for solving parity games"

Connected through hyperedge HE-2 (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"
    - "computing nested fixpoints in quasipolynomial time"
    - "parity games zielonka s algorithm in quasi polynomial time"
    - "universal trees grow inside separating automata quasi polynomial lower bounds for parity games"
    - "succinct progress measures for solving parity games"
    - "exponential lower bounds for policy iteration"

Connected through hyperedge HE-3 (induced by source paper "register games"):
  with members:
    - "universal trees grow inside separating automata quasi polynomial lower bounds for parity games"
    - "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"

Connected through hyperedge HE-4 (induced by source paper "good for games automata from nondeterminism to alternation"):
  with members:
    - "universal trees grow inside separating automata quasi polynomial lower bounds for parity games"

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)