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: "graphs with trivial overlap are context free"
  Abstract: String diagrams are a powerful tool for reasoning about composite structures in symmetric monoidal categories. By representing string diagrams as graphs, equational reasoning can be done automatically by double-pushout rewriting. !-graphs give us the means of expressing and proving properties about whole families of these graphs simultaneously. While !-graphs provide elegant proofs of surprisingly powerful theorems, little is known about the formal properties of the graph languages they define. This paper takes the first step in characterising these languages by showing that an important subclass of !-graphs--those whose repeated structures only overlap trivially--can be encoded using a (context-free) vertex replacement grammar.

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"
    - "rewriting context free families of string diagrams"
    - "equational reasoning with context free families of string diagrams"
    - "quantomatic a proof assistant for diagrammatic reasoning"
    - "reasoning with graphs"

Connected through hyperedge HE-2 (induced by source paper "quantomatic a proof assistant for diagrammatic reasoning"):
  with members:
    - "tinker tailor solver proof"
    - "tensors graphs and non commutative quantum structures"
    - "reasoning with graphs"
    - "synthesising graphical theories"
    - "experimental support for a categorical compositional distributional model of meaning"
    - "mathematical foundations for a compositional distributional model of meaning"

Connected through hyperedge HE-3 (induced by source paper "encoding tensors as graphs with neighbourhood orders"):
  with members:
    - "compositional distributional semantics with compact closed categories and frobenius algebras"
    - "tensors graphs and non commutative quantum structures"
    - "reasoning with graphs"
    - "graphical reasoning in compact closed categories for quantum computation"

Connected through hyperedge HE-4 (induced by source paper "equational reasoning with context free families of string diagrams"):
  with members:
    - "quantomatic a proof assistant for diagrammatic reasoning"

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.LO(Logic in Computer Science)