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: "modernizing phcpack through phcpy"
  Abstract: PHCpack is a large software package for solving systems of polynomial equations. The executable phc is menu driven and file oriented. This paper describes the development of phcpy, a Python interface to PHCpack. Instead of navigating through menus, users of phcpy solve systems in the Python shell or via scripts. Persistent objects replace intermediate files.

Connected through hyperedge HE-1 (induced by source paper "solving polynomial systems with phcpy"):
  with members:
    - "homotopycontinuation jl a package for homotopy continuation in julia"
    - "solving polynomial systems in the cloud with polynomial homotopy continuation"

Connected through hyperedge HE-2 (induced by source paper "computing all space curve solutions of polynomial systems by polyhedral methods"):
  with members:
    - "pruning algorithms for pretropisms of newton polytopes"
    - "computing puiseux series for algebraic surfaces"

Connected through hyperedge HE-3 (induced by source paper "accelerating polynomial homotopy continuation on a graphics processing unit with double double and quad double arithmetic"):
  with members:
    - "solving polynomial systems in the cloud with polynomial homotopy continuation"
    - "gpu acceleration of newton s method for large systems of polynomial equations in double double and quad double arithmetic"
    - "computing puiseux series for algebraic surfaces"
    - "orthogononalization on a general purpose graphics processing unit with double double and quad double arithmetic"
    - "evaluating polynomials in several variables and their derivatives on a gpu computing processor"

Connected through hyperedge HE-4 (induced by source paper "solving polynomial systems in the cloud with polynomial homotopy continuation"):
  with members:
    - "accelerating polynomial homotopy continuation on a graphics processing unit with double double and quad double arithmetic"
    - "tracking many solution paths of a polynomial homotopy on a graphics processing unit"
    - "a polyhedral method to compute all affine solution sets of sparse polynomial systems"
    - "practical graph isomorphism ii"
    - "computing puiseux series for algebraic surfaces"

Connected through hyperedge HE-5 (induced by source paper "tracking many solution paths of a polynomial homotopy on a graphics processing unit"):
  with members:
    - "accelerating polynomial homotopy continuation on a graphics processing unit with double double and quad double arithmetic"
    - "gpu acceleration of newton s method for large systems of polynomial equations in double double and quad double arithmetic"
    - "orthogononalization on a general purpose graphics processing unit with double double and quad double arithmetic"
    - "evaluating polynomials in several variables and their derivatives on a gpu computing processor"

Connected through hyperedge HE-6 (induced by source paper "a polyhedral method to compute all affine solution sets of sparse polynomial systems"):
  with members:
    - "computing puiseux series for algebraic surfaces"

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.MS(Mathematical Software)