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: "decision problems for convex languages"
  Abstract: We examine decision problems for various classes of convex languages, previously studied by Ang and Brzozowski under the name "continuous languages". We can decide whether a language L is prefix-, suffix-, factor-, or subword-convex in polynomial time if L is represented by a DFA, but the problem is PSPACE-hard if L is represented by an NFA. If a regular language is not convex, we prove tight upper bounds on the length of the shortest words demonstrating this fact, in terms of the number of states of an accepting DFA. Similar results are proved for some subclasses of convex languages: the prefix-, suffix-, factor-, and subword-closed languages, and the prefix-, suffix-, factor-, and subword-free languages.

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"
    - "upper bounds on syntactic complexity of left and two sided ideals"
    - "complexity of atoms combinatorially"

Connected through hyperedge HE-2 (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"
    - "quotient complexity of regular languages"

Connected through hyperedge HE-3 (induced by source paper "contractibility for open global constraints"):
  with members:
    - "decompositions of all different global cardinality and related constraints"
    - "the soft cumulative constraint"
    - "slide a useful special case of the cardpath constraint"
    - "flow based propagators for the sequence and related global constraints"

Connected through hyperedge HE-4 (induced by source paper "on the state complexity of closures and interiors of regular languages with subwords and superwords"):
  with members:
    - "decidability in the logic of subsequences and supersequences"
    - "refinement and difference for probabilistic automata"
    - "finite automata for the sub and superword closure of cfls descriptional and computational complexity"
    - "alternating towers and piecewise testable separators"
    - "the power of priority channel systems"
    - "computing downward closures for stacked counter automata"
    - "quotient complexity of ideal languages"
    - "the computational complexity of universality problems for prefixes suffixes factors and subwords of regular languages"

Connected through hyperedge HE-5 (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"
    - "upper bounds on syntactic complexity of left and two sided ideals"
    - "complexity of atoms combinatorially"

Connected through hyperedge HE-6 (induced by source paper "a survey on operational state complexity"):
  with members:
    - "maximally atomic languages"
    - "upper bounds on syntactic complexity of left and two sided ideals"
    - "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"

Connected through hyperedge HE-7 (induced by source paper "syntactic complexity of regular ideals"):
  with members:
    - "syntactic complexity of bifix free languages"
    - "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"
    - "quotient complexity of ideal languages"
    - "quotient complexity of closed languages"

Connected through hyperedge HE-8 (induced by source paper "checking whether an automaton is monotonic is np complete"):
  with members:
    - "on nonpermutational transformation semigroups with an application to syntactic complexity"
    - "synchronizing automata with large reset lengths"
    - "large aperiodic semigroups"
    - "experimental study of the shortest reset word of random automata"
    - "the complexity of finding reset words in finite automata"
    - "approximating the minimum length of synchronizing words is hard"

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.CC(Computational Complexity)