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: "profunctor optics modular data accessors"
  Abstract: CONTEXT: Data accessors allow one to read and write components of a data structure, such as the fields of a record, the variants of a union, or the elements of a container. These data accessors are collectively known as optics; they are fundamental to programs that manipulate complex data. INQUIRY: Individual data accessors for simple data structures are easy to write, for example as pairs of "getter" and "setter" methods. However, it is not obvious how to combine data accessors, in such a way that data accessors for a compound data structure are composed out of smaller data accessors for the parts of that structure. Generally, one has to write a sequence of statements or declarations that navigate step by step through the data structure, accessing one level at a time - which is to say, data accessors are traditionally not first-class citizens, combinable in their own right. APPROACH: We present a framework for modular data access, in which individual data accessors for simple data structures may be freely combined to obtain more complex data accessors for compound data structures. Data accessors become first-class citizens. The framework is based around the notion of profunctors, a flexible generalization of functions. KNOWLEDGE: The language features required are higher-order functions ("lambdas" or "closures"), parametrized types ("generics" or "abstract types"), and some mechanism for separating interfaces from implementations ("abstract classes" or "modules"). We use Haskell as a vehicle in which to present our constructions, but languages such as Java, C#, or Scala that provide the necessary features should work just as well. GROUNDING: We provide implementations of all our constructions, in the form of a literate program: the manuscript file for the paper is also the source code for the program, and the extracted code is available separately for evaluation. We also prove the essential properties demonstrating that our profunctor-based representations are precisely equivalent to the more familiar concrete representations. IMPORTANCE: Our results should pave the way to simpler ways of writing programs that access the components of compound data structures.

Connected through hyperedge HE-1 (induced by source paper "profunctor optics and traversals"):
  with members:
    - "understanding profunctor optics a representation theorem"
    - "reflections on monadic lenses"
    - "compositional game theory"
    - "notions of computation as monoids"
    - "a representation theorem for second order functionals"
    - "an investigation of the laws of traversals"

Connected through hyperedge HE-2 (induced by source paper "profunctor optics a categorical update"):
  with members:
    - "profunctor optics and traversals"
    - "understanding profunctor optics a representation theorem"
    - "lenses and learners"
    - "compositional game theory"
    - "a representation theorem for second order functionals"

Connected through hyperedge HE-3 (induced by source paper "understanding profunctor optics a representation theorem"):
  with members:
    - "reflections on monadic lenses"
    - "a representation theorem for second order functionals"

Connected through hyperedge HE-4 (induced by source paper "unifying semantic foundations for automated verification tools in isabelle utp"):
  with members:
    - "differential hoare logics and refinement calculi for hybrid systems with isabelle hol"
    - "calculational verification of reactive programs with reactive relations and kleene algebra"
    - "automating verification of state machines with reactive designs and isabelle utp"
    - "unifying theories of time with generalised reactive processes"
    - "robotics and integrated formal methods necessity meets opportunity"
    - "unifying theories of reactive design contracts"

Connected through hyperedge HE-5 (induced by source paper "the game semantics of game theory"):
  with members:
    - "morphisms of open games"
    - "compositional game theory"
    - "semantics of higher order quantum computation via geometry of interaction"
    - "retracing some paths in process algebra"
    - "mathematical foundations for a compositional distributional model of meaning"

Connected through hyperedge HE-6 (induced by source paper "composing bidirectional programs monadically with appendices"):
  with members:
    - "bidirectional evaluation with directmanipulation"

Connected through hyperedge HE-7 (induced by source paper "generic deriving of generic traversals"):
  with members:
    - "a representation theorem for second order functionals"
    - "functor is to lens as applicative is to biplate introducing multiplate"

Connected through hyperedge HE-8 (induced by source paper "morphisms of open games"):
  with members:
    - "a compositional treatment of iterated open games"
    - "compositional game theory"
    - "inapproximability of nash equilibrium"

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.PL(Programming Languages)