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: "schur number five"
  Abstract: We present the solution of a century-old problem known as Schur Number Five: What is the largest (natural) number $n$ such that there exists a five-coloring of the positive numbers up to $n$ without a monochromatic solution of the equation $a + b = c$? We obtained the solution, $n = 160$, by encoding the problem into propositional logic and applying massively parallel satisfiability solving techniques on the resulting formula. We constructed and validated a proof of the solution to increase trust in the correctness of the multi-CPU-year computations. The proof is two petabytes in size and was certified using a formally verified proof checker, demonstrating that any result by satisfiability solvers---no matter how large---can now be validated using highly trustworthy systems.

Connected through hyperedge HE-1 (induced by source paper "nonexistence certificates for ovals in a projective plane of order ten"):
  with members:
    - "applying computer algebra systems with sat solvers to the williamson conjecture"
    - "trimming graphs using clausal proof optimization"
    - "sat solvers and computer algebra systems a powerful combination for mathematics"
    - "the sat cas method for combinatorial search with applications to best matrices"
    - "a nonexistence certificate for projective planes of order ten with weight 15 codewords"
    - "complex golay pairs up to length 28 a search via computer algebra and programmatic sat"
    - "solving and verifying the boolean pythagorean triples problem via cube and conquer"
    - "computer aided proof of erdos discrepancy properties"

Connected through hyperedge HE-2 (induced by source paper "applying computer algebra systems with sat solvers to the williamson conjecture"):
  with members:
    - "enumeration of complex golay pairs via programmatic sat"
    - "a sat cas approach to finding good matrices new examples and counterexamples"
    - "solving and verifying the boolean pythagorean triples problem via cube and conquer"
    - "a sat attack on the erdos discrepancy conjecture"

Connected through hyperedge HE-3 (induced by source paper "guiding high performance sat solvers with unsat core predictions"):
  with members:
    - "learning a sat solver from single bit supervision"
    - "learning to branch"
    - "gamepad a learning environment for theorem proving"
    - "robustfill neural program learning under noisy i o"
    - "ray a distributed framework for emerging ai applications"
    - "deep network guided proof search"
    - "holstep a machine learning dataset for higher order logic theorem proving"
    - "premise selection for theorem proving by deep graph embedding"

Connected through hyperedge HE-4 (induced by source paper "a nonexistence certificate for projective planes of order ten with weight 15 codewords"):
  with members:
    - "sat solvers and computer algebra systems a powerful combination for mathematics"
    - "enumeration of complex golay pairs via programmatic sat"
    - "a sat cas approach to finding good matrices new examples and counterexamples"
    - "solving and verifying the boolean pythagorean triples problem via cube and conquer"
    - "computing the ramsey number r 4 3 3 using abstraction and symmetry breaking"
    - "computer aided proof of erdos discrepancy properties"
    - "practical graph isomorphism ii"
    - "green tao numbers and sat"

Connected through hyperedge HE-5 (induced by source paper "new ways to multiply 3 x 3 matrices"):
  with members:
    - "local search for fast matrix multiplication"
    - "fast feasible and unfeasible matrix multiplication"
    - "laderman matrix multiplication algorithm can be constructed using strassen algorithm and related tensor s isotropies"
    - "a non commutative algorithm for multiplying 5 5 matrices using 99 multiplications"
    - "solving and verifying the boolean pythagorean triples problem via cube and conquer"
    - "powers of tensors and fast matrix multiplication"
    - "a new general purpose method to multiply 3x3 matrices using only 23 multiplications"

Connected through hyperedge HE-6 (induced by source paper "the sat cas method for combinatorial search with applications to best matrices"):
  with members:
    - "applying computer algebra systems with sat solvers to the williamson conjecture"
    - "complex golay pairs up to length 28 a search via computer algebra and programmatic sat"
    - "enumeration of complex golay pairs via programmatic sat"
    - "a sat cas approach to finding good matrices new examples and counterexamples"
    - "solving and verifying the boolean pythagorean triples problem via cube and conquer"
    - "green tao numbers and sat"
    - "satisfiability and computing van der waerden numbers"

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.LO(Logic in Computer Science)