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 "syntactic complexity of suffix free languages"):
  Abstract: We solve an open problem concerning syntactic complexity: We prove that the cardinality of the syntactic semigroup of a suffix-free language with $n$ left quotients (that is, with state complexity $n$) is at most $(n-1)^{n-2}+n-2$ for $n\ge 6$. Since this bound is known to be reachable, this settles the problem. We also reduce the alphabet of the witness languages reaching this bound to five letters instead of $n+2$, and show that it cannot be any smaller. Finally, we prove that the transition semigroup of a minimal deterministic automaton accepting a witness language is unique for each $n$.

Includes members:
  Member "complexity of suffix free regular languages":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "most complex non returning regular languages")
  Member "syntactic complexity of regular ideals":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "towards a theory of complexity of regular languages")
  Member "syntactic complexity of prefix suffix bifix and factor free regular languages":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "syntactic complexity of bifix free languages")
  Member "syntactic complexity of ideal and closed languages":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "towards a theory of complexity of regular languages")
  Member "decision problems for convex languages":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "towards a theory of complexity of regular languages")
  Member "quotient complexity of regular languages":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "complexity of the frobenius monoid problem for a finite language")

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.FL(Formal Languages and Automata Theory)