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: "a refined difference field theory for symbolic summation"
  Abstract: In this article we present a refined summation theory based on Karr's difference field approach. The resulting algorithms find sum representations with optimal nested depth. For instance, the algorithms have been applied successively to evaluate Feynman integrals from Perturbative Quantum Field Theory.

Connected through hyperedge HE-1 (induced by source paper "a refined machinery to calculate large moments from coupled systems of linear differential equations"):
  with members:
    - "minimal representations and algebraic relations for single nested products"
    - "computing the inverse mellin transform of holonomic sequences using kovacic s algorithm"
    - "representing q hypergeometric products and mixed versions in difference rings"
    - "algorithms to solve coupled systems of differential equations in terms of power series"
    - "a toolbox to solve coupled systems of differential and difference equations"
    - "algebraic independence of sequences generated by cyclotomic harmonic sums"
    - "a difference ring theory for symbolic summation"
    - "the package harmonicsums computer algebra and analytic aspects of nested sums"

Connected through hyperedge HE-2 (induced by source paper "minimal representations and algebraic relations for single nested products"):
  with members:
    - "a difference ring theory for symbolic summation"
    - "on the structure of compatible rational functions"
    - "creative telescoping for holonomic functions"
    - "fast algorithms for refined parameterized telescoping in difference fields"
    - "fast computation of smith forms of sparse matrices over local rings"
    - "order degree curves for hypergeometric creative telescoping"
    - "a symbolic summation approach to find optimal nested sum representations"
    - "parameterized telescoping proves algebraic independence of sums"

Connected through hyperedge HE-3 (induced by source paper "towards a symbolic summation theory for unspecified sequences"):
  with members:
    - "representing q hypergeometric products and mixed versions in difference rings"
    - "summation theory ii characterizations of boldsymbol r pi sigma extensions and algorithmic aspects"
    - "algebraic independence of sequences generated by cyclotomic harmonic sums"
    - "a difference ring theory for symbolic summation"
    - "a streamlined difference ring theory indefinite nested sums the alternating sign and the parameterized telescoping problem"
    - "fast algorithms for refined parameterized telescoping in difference fields"

Connected through hyperedge HE-4 (induced by source paper "refined holonomic summation algorithms in particle physics"):
  with members:
    - "representing q hypergeometric products and mixed versions in difference rings"
    - "a difference ring theory for symbolic summation"
    - "modern summation methods for loop integrals in quantum field theory the packages sigma evaluatemultisums and sumproduction"
    - "complexity estimates for two uncoupling algorithms"
    - "fast algorithms for refined parameterized telescoping in difference fields"
    - "a symbolic summation approach to feynman integral calculus"
    - "advanced computer algebra algorithms for the expansion of feynman integrals"
    - "a fast approach to creative telescoping"

Connected through hyperedge HE-5 (induced by source paper "representing q hypergeometric products and mixed versions in difference rings"):
  with members:
    - "summation theory ii characterizations of boldsymbol r pi sigma extensions and algorithmic aspects"
    - "a difference ring theory for symbolic summation"
    - "a streamlined difference ring theory indefinite nested sums the alternating sign and the parameterized telescoping problem"
    - "on the structure of compatible rational functions"
    - "fast algorithms for refined parameterized telescoping in difference fields"
    - "parameterized telescoping proves algebraic independence of sums"

Connected through hyperedge HE-6 (induced by source paper "some open problems related to creative telescoping"):
  with members:
    - "efficient algorithms for mixed creative telscoping"
    - "existence problem of telescopers beyond the bivariate case"
    - "computing hypergeometric solutions of second order linear differential equations using quotients of formal solutions and integral bases"
    - "reduction based creative telescoping for algebraic functions"
    - "new bounds for hypergeometric creative telescoping"
    - "multiple binomial sums"
    - "a modified abramov petkovsek reduction and creative telescoping for hypergeometric terms"
    - "an algorithm for deciding the summability of bivariate rational functions"

Connected through hyperedge HE-7 (induced by source paper "algorithms to solve coupled systems of differential equations in terms of power series"):
  with members:
    - "summation theory ii characterizations of boldsymbol r pi sigma extensions and algorithmic aspects"
    - "a toolbox to solve coupled systems of differential and difference equations"
    - "inverse mellin transform of holonomic sequences"
    - "algebraic independence of cyclotomic harmonic sums"
    - "a difference ring theory for symbolic summation"
    - "a streamlined difference ring theory indefinite nested sums the alternating sign and the parameterized telescoping problem"
    - "recent symbolic summation methods to solve coupled systems of differential and difference equations"
    - "modern summation methods for loop integrals in quantum field theory the packages sigma evaluatemultisums and sumproduction"

Connected through hyperedge HE-8 (induced by source paper "summation theory ii characterizations of boldsymbol r pi sigma extensions and algorithmic aspects"):
  with members:
    - "algebraic independence of cyclotomic harmonic sums"
    - "a difference ring theory for symbolic summation"
    - "a streamlined difference ring theory indefinite nested sums the alternating sign and the parameterized telescoping problem"
    - "simplifying multiple sums in difference fields"
    - "creative telescoping for holonomic functions"
    - "fast algorithms for refined parameterized telescoping in difference fields"
    - "order degree curves for hypergeometric creative telescoping"
    - "on the existence of telescopers for mixed hypergeometric terms"

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.SC(Symbolic Computation)