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: "understanding profunctor optics a representation theorem"
  Abstract: Optics, aka functional references, are classes of tools that allow composable access into compound data structures. Usually defined as programming language libraries, they provide combinators to manipulate different shapes of data such as sums, products and collections, that can be composed to operate on larger structures. Together they form a powerful language to describe transformations of data. Among the different approaches to describing optics, one particular type of optics, called profunctor optics, stands out. It describes alternative but equivalent representations of most of the common combinators, and enhances them with elegant composability properties via a higher-order encoding. Notably, it enables easy composition across different optic families. Unfortunately, profunctor optics are difficult to reason about, and linking usual optics with an equivalent profunctor representation has so far been done on a case-by-case basis, with definitions that sometimes seem very ad hoc. This makes it hard both to analyse properties of existing profunctor optics and to define new ones. This thesis presents an equivalent representation of profunctor optics, called isomorphism optics, that is both closer to intuition and easier to reason about. This tool enables powerful theorems to be derived generically about profunctor optics. Finally, this thesis develops a framework to ease deriving new profunctor encodings from concrete optic families.

Connected through hyperedge HE-1 (induced by source paper "profunctor optics and traversals"):
  with members:
    - "profunctor optics modular data accessors"
    - "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"
    - "lenses and learners"
    - "profunctor optics modular data accessors"
    - "compositional game theory"
    - "a representation theorem for second order functionals"

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)