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 the determination of cusp points of 3 rpr parallel manipulators"
  Abstract: This paper investigates the cuspidal configurations of 3-RPR parallel manipulators that may appear on their singular surfaces in the joint space. Cusp points play an important role in the kinematic behavior of parallel manipulators since they make possible a non-singular change of assembly mode. In previous works, the cusp points were calculated in sections of the joint space by solving a 24th-degree polynomial without any proof that this polynomial was the only one that gives all solutions. The purpose of this study is to propose a rigorous methodology to determine the cusp points of 3-RPR manipulators and to certify that all cusp points are found. This methodology uses the notion of discriminant varieties and resorts to Grobner bases for the solutions of systems of equations.

Connected through hyperedge HE-1 (induced by source paper "an algebraic method to check the singularity free paths for parallel robots"):
  with members:
    - "non singular assembly mode changing trajectories in the workspace for the 3 rps parallel robot"
    - "uniqueness domains and non singular assembly mode changing trajectories"
    - "kinematics and workspace analysis of a three axis parallel manipulator the orthoglide"
    - "an interval analysis based study for the design and the comparison of 3 dof parallel kinematic machines"
    - "an exhaustive study of the workspace topologies of all 3r orthogonal manipulators with geometric simplifications"

Connected through hyperedge HE-2 (induced by source paper "non singular assembly mode changing trajectories in the workspace for the 3 rps parallel robot"):
  with members:
    - "uniqueness domains and non singular assembly mode changing trajectories"
    - "non singular assembly mode changing motions for 3 rpr parallel manipulators"
    - "definition sets for the direct kinematics of parallel manipulators"

Connected through hyperedge HE-3 (induced by source paper "cusp points in the parameter space of degenerate 3 rpr planar parallel manipulators"):
  with members:
    - "uniqueness domains and non singular assembly mode changing trajectories"
    - "kinematic analysis of a class of analytic planar 3 rpr parallel manipulators"
    - "singular curves in the joint space and cusp points of 3 rpr parallel manipulators"
    - "degeneracy study of the forward kinematics of planar 3 rpr parallel manipulators"

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.RO(Robotics)