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: "rewriting context free families of string diagrams"
  Abstract: String diagrams provide a convenient graphical framework which may be used for  equational reasoning about morphisms of monoidal categories. However, unlike  term rewriting, which is the standard way of reasoning about the morphisms of  monoidal categories, rewriting string diagrams results in shorter equational  proofs, because the string diagrammatic representation allows us to formally  establish equalities modulo any rewrite steps which follow from the monoidal  structure.   Manipulating string diagrams by hand is a time-consuming and error-prone  process, especially for large string diagrams. This can be ameliorated by using  software proof assistants, such as Quantomatic.   However, reasoning about concrete string diagrams may be limiting and in some  scenarios it is necessary to reason about entire (infinite) families of string  diagrams. When doing so, we face the same problems as for manipulating concrete  string diagrams, but in addition, we risk making further mistakes if we are not  precise enough about the way we represent (infinite) families of string  diagrams.   The primary goal of this thesis is to design a mathematical framework for  equational reasoning about infinite families of string diagrams which is  amenable to computer automation. We will be working with context-free families  of string diagrams and we will represent them using context-free graph  grammars. We will model equations between infinite families of diagrams using  rewrite rules between context-free grammars. Our framework represents  equational reasoning about concrete string diagrams and context-free families  of string diagrams using double-pushout rewriting on graphs and context-free  graph grammars respectively. We will prove that our representation is sound by  showing that it respects the concrete semantics of string diagrammatic  reasoning and we will show that our framework is appropriate for software  implementation by proving important decidability properties.

Connected through hyperedge HE-1 (induced by source paper "a framework for rewriting families of string diagrams"):
  with members:
    - "enriching a linear non linear lambda calculus a programming language for string diagrams"
    - "equational reasoning with context free families of string diagrams"
    - "quantomatic a proof assistant for diagrammatic reasoning"
    - "graphs with trivial overlap are context free"
    - "reasoning with graphs"

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)