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: "convolutional codes from units in matrix and group rings"
  Abstract: A general method for the construction and analysis of convolu- tional codes from units in Laurent series over matrix rings is presented. Using group rings as matrix rings, this gives a general method for the construction and analysis of convolutional codes from group rings. A theory of group ring convolutional codes is developed. Series of convolutional codes are constructed algebraically and algebraic methods are used to compute free distances and to construct convolutional codes to prescribed minimum distances.

Connected through hyperedge HE-1 (induced by source paper "coding theory the unit derived methodology"):
  with members:
    - "solving underdetermined systems with error correcting codes"
    - "systems of mds codes from units and idempotents"
    - "codes from zero divisors and units in group rings"
    - "self dual dual containing and related quantum codes from group rings"

Connected through hyperedge HE-2 (induced by source paper "self dual dual containing and related quantum codes from group rings"):
  with members:
    - "codes from zero divisors and units in group rings"

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.IT(Information Theory)