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: "upper bounds on syntactic complexity of left and two sided ideals"
  Abstract: We solve two open problems concerning syntactic complexity: We prove that the cardinality of the syntactic semigroup of a left ideal or a suffix-closed language with $n$ left quotients (that is, with state complexity $n$) is at most $n^{n-1}+n-1$, and that of a two-sided ideal or a factor-closed language is at most $n^{n-2}+(n-2)2^{n-2}+1$. Since these bounds are known to be reachable, this settles the problems.

Connected through hyperedge HE-1 (induced by source paper "towards a theory of complexity of regular languages"):
  with members:
    - "most complex non returning regular languages"
    - "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"
    - "syntactic complexity of regular ideals"
    - "maximally atomic languages"
    - "complexity of atoms combinatorially"
    - "symmetric groups and quotient complexity of boolean operations"

Connected through hyperedge HE-2 (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"
    - "complexity of atoms combinatorially"
    - "symmetric groups and quotient complexity of boolean operations"
    - "quotient complexities of atoms of regular languages"

Connected through hyperedge HE-3 (induced by source paper "syntactic complexity of bifix free languages"):
  with members:
    - "on nonpermutational transformation semigroups with an application to syntactic complexity"
    - "large aperiodic semigroups"
    - "syntactic complexity of prefix suffix bifix and factor free regular languages"
    - "theory of atomata"
    - "syntactic complexity of ideal and closed languages"
    - "quotient complexity of regular languages"

Connected through hyperedge HE-4 (induced by source paper "complexity of suffix free regular languages"):
  with members:
    - "complexity of proper suffix convex regular languages"
    - "most complex non returning regular languages"
    - "unrestricted state complexity of binary operations on regular languages"
    - "complexity of prefix convex regular languages"
    - "syntactic complexity of bifix free languages"
    - "quotient complexities of atoms in regular ideal languages"
    - "complexity of atoms combinatorially"
    - "symmetric groups and quotient complexity of boolean operations"

Connected through hyperedge HE-5 (induced by source paper "a survey on operational state complexity"):
  with members:
    - "maximally atomic languages"
    - "syntactic complexity of r and j trivial regular languages"
    - "most complex regular right ideal languages"
    - "the state complexity of star complement star"
    - "quotient complexity of star free languages"
    - "the magic number problem for subregular language families"
    - "nondeterministic state complexity for suffix free regular languages"
    - "quotient complexity of ideal languages"

Connected through hyperedge HE-6 (induced by source paper "most complex regular ideal 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"
    - "syntactic complexity of regular ideals"
    - "complexity of atoms combinatorially"
    - "symmetric groups and quotient complexity of boolean operations"
    - "quotient complexities of atoms of regular languages"
    - "theory of atomata"

Connected through hyperedge HE-7 (induced by source paper "syntactic complexity of regular ideals"):
  with members:
    - "syntactic complexity of bifix free languages"
    - "large aperiodic semigroups"
    - "syntactic complexity of prefix suffix bifix and factor free regular languages"
    - "theory of atomata"
    - "syntactic complexity of ideal and closed languages"
    - "quotient complexity of ideal languages"
    - "quotient complexity of closed languages"
    - "decision problems for convex languages"

Connected through hyperedge HE-8 (induced by source paper "quotient complexities of atoms in regular ideal languages"):
  with members:
    - "maximally atomic languages"
    - "quotient complexities of atoms of regular languages"
    - "theory of atomata"
    - "syntactic complexity of ideal and closed languages"
    - "quotient complexity of ideal languages"
    - "quotient complexity of regular 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)