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: "pairwise comparisons simplified"
  Abstract: This study examines the notion of generators of a pairwise comparisons matrix. Such approach decreases the number of pairwise comparisons from $n\cdot (n-1)$ to $n-1$. An algorithm of reconstructing of the PC matrix from its set of generators is presented.

Connected through hyperedge HE-1 (induced by source paper "on orthogonal projections on the space of consistent pairwise comparisons matrices"):
  with members:
    - "on projection based operators in lp space for exact similarity search"
    - "on distance based inconsistency reduction algorithms for pairwise comparisons"
    - "an orthogonal basis for computing a consistent approximation to a pairwise comparisons matrix"

Connected through hyperedge HE-2 (induced by source paper "on normalization of inconsistency indicators in pairwise comparisons"):
  with members:
    - "pairwise comparisons rating scale paradox"
    - "inconsistency indicator maps on groups for pairwise comparisons"
    - "on axiomatization of inconsistency indicators for pairwise comparisons"

Connected through hyperedge HE-3 (induced by source paper "on the convergence of the pairwise comparisons inconsistency reduction process"):
  with members:
    - "a monte carlo study of pairwise comparisons"
    - "on axiomatization of inconsistency indicators for pairwise comparisons"
    - "on distance based inconsistency reduction algorithms for pairwise comparisons"

Connected through hyperedge HE-4 (induced by source paper "mathematical foundations of inconsistency analysis in pairwise comparisons"):
  with members:
    - "on axiomatization of inconsistency indicators for pairwise comparisons"

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.DM(Discrete Mathematics)