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: "quotient complexity of regular languages"
  Abstract: The past research on the state complexity of operations on regular languages is examined, and a new approach based on an old method (derivatives of regular expressions) is presented. Since state complexity is a property of a language, it is appropriate to define it in formal-language terms as the number of distinct quotients of the language, and to call it "quotient complexity". The problem of finding the quotient complexity of a language f(K,L) is considered, where K and L are regular languages and f is a regular operation, for example, union or concatenation. Since quotients can be represented by derivatives, one can find a formula for the typical quotient of f(K,L) in terms of the quotients of K and L. To obtain an upper bound on the number of quotients of f(K,L) all one has to do is count how many such quotients are possible, and this makes automaton constructions unnecessary. The advantages of this point of view are illustrated by many examples. Moreover, new general observations are presented to help in the estimation of the upper bounds on quotient complexity of regular operations.

Connected through hyperedge HE-1 (induced by source paper "complexity of the frobenius monoid problem for a finite language"):
  with members:
    - "an np hardness result on the monoid frobenius problem"
    - "the frobenius problem in a free monoid"

Connected through hyperedge HE-2 (induced by source paper "maximal state complexity and generalized de bruijn words"):
  with members:
    - "generalized de bruijn words and the state complexity of conjugate sets"

Connected through hyperedge HE-3 (induced by source paper "primitivity uniform minimality and state complexity of boolean operations"):
  with members:
    - "unrestricted state complexity of binary operations on regular languages"
    - "unrestricted state complexity of binary operations on regular and ideal languages"
    - "most complex regular ideal languages"
    - "a survey on operational state complexity"
    - "symmetric groups and quotient complexity of boolean operations"
    - "quotient complexity of star free languages"
    - "quotient complexity of ideal languages"

Connected through hyperedge HE-4 (induced by source paper "complexity of regular bifix free languages"):
  with members:
    - "most complex non returning regular languages"
    - "most complex regular ideals"
    - "complexity of atoms combinatorially"
    - "theory of atomata"
    - "syntactic complexity of ideal and closed languages"
    - "decision problems for convex languages"

Connected through hyperedge HE-5 (induced by source paper "complexity of left ideal suffix closed and suffix free regular languages"):
  with members:
    - "unrestricted state complexity of binary operations on regular languages"
    - "unrestricted state complexity of binary operations on regular and ideal languages"
    - "quotient complexities of atoms in regular ideal languages"
    - "most complex regular ideal languages"
    - "syntactic complexity of regular ideals"
    - "upper bounds on syntactic complexity of left and two sided ideals"
    - "complexity of atoms combinatorially"
    - "symmetric groups and quotient complexity of boolean operations"

Connected through hyperedge HE-6 (induced by source paper "complexity of prefix convex regular languages"):
  with members:
    - "unrestricted state complexity of binary operations on regular languages"
    - "quotient complexities of atoms in regular ideal languages"
    - "most complex regular ideal languages"
    - "syntactic complexity of regular ideals"
    - "maximally atomic languages"
    - "complexity of atoms combinatorially"
    - "symmetric groups and quotient complexity of boolean operations"
    - "quotient complexities of atoms of regular languages"

Connected through hyperedge HE-7 (induced by source paper "unrestricted state complexity of binary operations on regular and ideal languages"):
  with members:
    - "unrestricted state complexity of binary operations on regular languages"
    - "complexity of atoms combinatorially"
    - "symmetric groups and quotient complexity of boolean operations"
    - "theory of atomata"
    - "transition complexity of incomplete dfas"
    - "syntactic complexity of ideal and closed languages"
    - "quotient complexity of ideal languages"

Connected through hyperedge HE-8 (induced by source paper "syntactic complexity of bifix free languages"):
  with members:
    - "on nonpermutational transformation semigroups with an application to syntactic complexity"
    - "upper bounds on syntactic complexity of left and two sided ideals"
    - "large aperiodic semigroups"
    - "syntactic complexity of prefix suffix bifix and factor free regular languages"
    - "theory of atomata"
    - "syntactic complexity of ideal and closed languages"

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)