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: "body and cad geometric constraint systems"
  Abstract: Motivated by constraint-based CAD software, we develop the foundation for the rigidity theory of a very general model: the body-and-cad structure, composed of rigid bodies in 3D constrained by pairwise coincidence, angular and distance constraints. We identify 21 relevant geometric constraints and develop the corresponding infinitesimal rigidity theory for these structures. The classical body-and-bar rigidity model can be viewed as a body-and-cad structure that uses only one constraint from this new class. As a consequence, we identify a new, necessary, but not sufficient, counting condition for minimal rigidity of body-and-cad structures: nested sparsity. This is a slight generalization of the well-known sparsity condition of Maxwell.

Connected through hyperedge HE-1 (induced by source paper "variational b rep model analysis for direct modeling using geometric perturbation"):
  with members:
    - "push pull direct modeling of solid cad models"
    - "reduction of constraint systems"

Connected through hyperedge HE-2 (induced by source paper "combinatorial rigidity of incidence systems and application to dictionary learning"):
  with members:
    - "optimal decomposition and recombination of isostatic geometric constraint systems for designing layered materials"
    - "reduction of constraint systems"
    - "new algorithms for learning incoherent and overcomplete dictionaries"
    - "learning sparsely used overcomplete dictionaries via alternating minimization"
    - "the algebraic combinatorial approach for low rank matrix completion"
    - "generalized principal component analysis gpca"
    - "exact recovery of sparsely used dictionaries"
    - "combinatorics and the rigidity of cad systems"

Connected through hyperedge HE-3 (induced by source paper "an incidence geometry approach to dictionary learning"):
  with members:
    - "new algorithms for learning incoherent and overcomplete dictionaries"
    - "learning sparsely used overcomplete dictionaries via alternating minimization"
    - "generalized principal component analysis gpca"
    - "exact recovery of sparsely used dictionaries"
    - "combinatorics and the rigidity of cad systems"
    - "on affine rigidity"

Connected through hyperedge HE-4 (induced by source paper "algorithms for detecting dependencies and rigid subsystems for cad"):
  with members:
    - "nucleation free 3d rigidity"
    - "combinatorics and the rigidity of cad systems"
    - "rigid components in fixed lattice and cone frameworks"

Connected through hyperedge HE-5 (induced by source paper "special positions of body and cad frameworks"):
  with members:
    - "combinatorics and the rigidity of cad systems"
    - "rigid components in fixed lattice and cone frameworks"

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)