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: "on optimal 2 and 3 planar graphs"
  Abstract: A graph is $k$-planar if it can be drawn in the plane such that no edge is crossed more than $k$ times. While for $k=1$, optimal $1$-planar graphs, i.e., those with $n$ vertices and exactly $4n-8$ edges, have been completely characterized, this has not been the case for $k \geq 2$. For $k=2,3$ and $4$, upper bounds on the edge density have been developed for the case of simple graphs by Pach and Toth, Pach et al. and Ackerman, which have been used to improve the well-known "Crossing Lemma". Recently, we proved that these bounds also apply to non-simple $2$- and $3$-planar graphs without homotopic parallel edges and self-loops. #R##N#In this paper, we completely characterize optimal $2$- and $3$-planar graphs, i.e., those that achieve the aforementioned upper bounds. We prove that they have a remarkably simple regular structure, although they might be non-simple. The new characterization allows us to develop notable insights concerning new inclusion relationships with other graph classes.

Connected through hyperedge HE-1 (induced by source paper "book embeddings of nonplanar graphs with small faces in few pages"):
  with members:
    - "a survey on graph drawing beyond planarity"
    - "upward partitioned book embeddings"
    - "an annotated bibliography on 1 planarity"
    - "stack and queue layouts via layered separators"
    - "the book thickness of 1 planar graphs is constant"
    - "on the book thickness of 1 planar graphs"
    - "planar embeddings with small and uniform faces"

Connected through hyperedge HE-2 (induced by source paper "simple k planar graphs are simple k 1 quasiplanar"):
  with members:
    - "a survey on graph drawing beyond planarity"
    - "on the relationship between k planar and k quasi planar graphs"
    - "two planar graphs are quasiplanar"
    - "on the density of non simple 3 planar graphs"
    - "recognizing and drawing ic planar graphs"
    - "the density of fan planar graphs"
    - "on the number of edges of fan crossing free graphs"

Connected through hyperedge HE-3 (induced by source paper "a survey on graph drawing beyond planarity"):
  with members:
    - "parameterized complexity of 1 planarity"
    - "minimum weight connectivity augmentation for planar straight line graphs"
    - "compact drawings of 1 planar graphs with right angle crossings and few bends"
    - "drawing subcubic 1 planar graphs with few bends few slopes and large angles"
    - "turning cliques into paths to achieve planarity"
    - "a heuristic approach towards drawings of graphs with high crossing resolution"
    - "on rac drawings of graphs with one bend per edge"
    - "recognizing optimal 1 planar graphs in linear time"

Connected through hyperedge HE-4 (induced by source paper "turning cliques into paths to achieve planarity"):
  with members:
    - "a survey on graph drawing beyond planarity"
    - "the partition spanning forest problem"
    - "revisited experimental comparison of node link and matrix representations"
    - "nodetrix planarity testing with small clusters"
    - "an annotated bibliography on 1 planarity"
    - "computing nodetrix representations of clustered graphs"
    - "intersection link representations of graphs"
    - "minimum weight triangulation is np hard"

Connected through hyperedge HE-5 (induced by source paper "polyline drawings with topological constraints"):
  with members:
    - "a survey on graph drawing beyond planarity"
    - "compact drawings of 1 planar graphs with right angle crossings and few bends"
    - "an annotated bibliography on 1 planarity"
    - "new results on edge partitions of 1 plane graphs"
    - "relating graph thickness to planar layers and bend complexity"
    - "straight line drawability of a planar graph plus an edge"
    - "convex arc drawings of pseudolines"

Connected through hyperedge HE-6 (induced by source paper "on the relationship between k planar and k quasi planar graphs"):
  with members:
    - "two planar graphs are quasiplanar"
    - "on the density of non simple 3 planar graphs"
    - "recognizing and drawing ic planar graphs"
    - "on the recognition of fan planar and maximal outer fan planar graphs"
    - "the density of fan planar graphs"
    - "on the number of edges of fan crossing free graphs"
    - "relaxing the constraints of clustered planarity"

Connected through hyperedge HE-7 (induced by source paper "two planar graphs are quasiplanar"):
  with members:
    - "on the relationship between k planar and k quasi planar 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.CG(Computational Geometry)