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: "the art gallery problem is exists mathbb r complete"
  Abstract: We prove that the art gallery problem is equivalent under polynomial time reductions to deciding whether a system of polynomial equations over the real numbers has a solution. The art gallery problem is a classical problem in computational geometry. Given a simple polygon $P$ and an integer $k$, the goal is to decide if there exists a set $G$ of $k$ guards within $P$ such that every point $p\in P$ is seen by at least one guard $g\in G$. Each guard corresponds to a point in the polygon $P$, and we say that a guard $g$ sees a point $p$ if the line segment $pg$ is contained in $P$. #R##N#The art gallery problem has stimulated extensive research in geometry and in algorithms. However, the complexity status of the art gallery problem has not been resolved. It has long been known that the problem is $\text{NP}$-hard, but no one has been able to show that it lies in $\text{NP}$. Recently, the computational geometry community became more aware of the complexity class $\exists \mathbb{R}$. The class $\exists \mathbb{R}$ consists of problems that can be reduced in polynomial time to the problem of deciding whether a system of polynomial equations with integer coefficients and any number of real variables has a solution. It can be easily seen that $\text{NP}\subseteq \exists \mathbb{R}$. We prove that the art gallery problem is $\exists \mathbb{R}$-complete, implying that (1) any system of polynomial equations over the real numbers can be encoded as an instance of the art gallery problem, and (2) the art gallery problem is not in the complexity class $\text{NP}$ unless $\text{NP}=\exists \mathbb{R}$. As a corollary of our construction, we prove that for any real algebraic number $\alpha$ there is an instance of the art gallery problem where one of the coordinates of the guards equals $\alpha$ in any guard set of minimum cardinality. That rules out many geometric approaches to the problem.

Connected through hyperedge HE-1 (induced by source paper "optimal curve straightening is exists mathbb r complete"):
  with members:
    - "a universality theorem for nested polytopes"
    - "min cost flow in unit capacity planar graphs"
    - "the complexity of drawing graphs on few lines and few planes"
    - "recognising multidimensional euclidean preferences"
    - "intersection graphs of rays and grounded segments"
    - "the complexity of tensor rank"
    - "recognition and complexity of point visibility graphs"
    - "the complexity of simultaneous geometric graph embedding"

Connected through hyperedge HE-2 (induced by source paper "the complexity of drawing a graph in a polygonal region"):
  with members:
    - "forall exists mathbb r completeness and area universality"
    - "on the complexity of minimum link path problems"
    - "irrational guards are sometimes needed"
    - "the galois complexity of graph drawing why numerical solutions are ubiquitous for force directed spectral and circle packing drawings"
    - "drawing partially embedded and simultaneously planar graphs"
    - "intersection graphs of segments and exists mathbb r"
    - "drawing graphs in the plane with a prescribed outer face and polynomial area"

Connected through hyperedge HE-3 (induced by source paper "a universality theorem for allowable sequences with applications"):
  with members:
    - "recognition and complexity of point visibility graphs"
    - "intersection graphs of segments and exists mathbb r"

Connected through hyperedge HE-4 (induced by source paper "drawing clustered graphs on disk arrangements"):
  with members:
    - "recognizing weak embeddings of graphs"
    - "a new perspective on clustered planarity as a combinatorial embedding problem"

Connected through hyperedge HE-5 (induced by source paper "on realistic target coverage by autonomous drones"):
  with members:
    - "design challenges of multi uav systems in cyber physical applications a comprehensive survey and future directions"
    - "obstacle avoidance strategy using onboard stereo vision on a flapping wing mav"
    - "directing cinematographic drones"
    - "towards a drone cinematographer guiding quadrotor cameras using visual composition principles"
    - "wigest a ubiquitous wifi based gesture recognition system"
    - "ubibreathe a ubiquitous non invasive wifi based breathing estimator"
    - "context aware computing for the internet of things a survey"

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)