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 "solving of regular equations revisited extended version"):
  Abstract: Solving of regular equations via Arden's Lemma is folklore knowledge. #R##N#We first give a concise algorithmic specification of all elementary solving steps. #R##N#We then discuss a computational interpretation of solving in terms of coercions that transform parse trees of regular equations into parse trees of solutions. #R##N#Thus, we can identify some conditions on the shape of regular equations under which resulting solutions are unambiguous. #R##N#We apply our result to convert a DFA to an unambiguous regular expression. #R##N#In addition, we show that operations such as subtraction and shuffling can be expressed via some appropriate set of regular equations. #R##N#Thus, we obtain direct (algebraic) methods without having to convert to and from finite automaton.

Includes members:
  Member "derivative based diagnosis of regular expression ambiguity":
    also connected through other hyperedges:
      (none)
  Member "derivatives for enhanced regular expressions":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "partial derivatives for context free languages from mu regular expressions to pushdown automata")
  Member "automata and rational expressions":
    also connected through other hyperedges:
      (none)
  Member "from finite automata to regular expressions and back a summary on descriptional complexity":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "learning interpretable models in the property specification language")
  Member "a general framework for the derivation of regular expressions":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "partial derivatives for context free languages from mu regular expressions to pushdown automata")
  Member "state elimination ordering strategies some experimental results":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "from finite automata to regular expressions and back a summary on descriptional complexity")

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)