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: "atp and presentation service for mizar formalizations"
  Abstract: This paper describes the Automated Reasoning for Mizar (MizAR) service, which integrates several automated reasoning, artificial intelligence, and presentation tools with Mizar and its authoring environment. The service provides ATP assistance to Mizar authors in finding and explaining proofs, and offers generation of Mizar problems as challenges to ATP systems. The service is based on a sound translation from the Mizar language to that of first-order ATP systems, and relies on the recent progress in application of ATP systems in large theories containing tens of thousands of available facts. We present the main features of MizAR services, followed by an account of initial experiments in finding proofs with the ATP assistance. Our initial experience indicates that the tool offers substantial help in exploring the Mizar library and in preparing new Mizar articles.

Connected through hyperedge HE-1 (induced by source paper "proof mining with dependent types"):
  with members:
    - "goal translation for a hammer for coq extended abstract"
    - "sepia search for proofs using inferred automata"
    - "learning assisted theorem proving with millions of lemmas"
    - "hipster integrating theory exploration in a proof assistant"
    - "mining state based models from proof corpora"
    - "recycling proof patterns in coq case studies"
    - "lemma mining over hol light"
    - "proof pattern recognition and lemma discovery in acl2"

Connected through hyperedge HE-2 (induced by source paper "documentation generator focusing on symbols for the html ized mizar library"):
  with members:
    - "pide for asynchronous interaction with coq"
    - "premise selection for mathematics by corpus analysis and kernel methods"
    - "pide as front end technology for coq"
    - "isabelle jedit a prover ide within the pide framework"
    - "large formal wikis issues and solutions"
    - "licensing the mizar mathematical library"
    - "a wiki for mizar motivation considerations and initial prototype"

Connected through hyperedge HE-3 (induced by source paper "mizar 40 for mizar 40"):
  with members:
    - "premise selection for mathematics by corpus analysis and kernel methods"
    - "machine learner for automated reasoning 0 4 and 0 5"
    - "blistr the blind strategymaker"
    - "hol y hammer online atp service for hol light"
    - "theorem proving in large formal mathematics as an emerging ai field"
    - "learning assisted automated reasoning with flyspeck"

Connected through hyperedge HE-4 (induced by source paper "initial experiments with tptp style automated theorem provers on acl2 problems"):
  with members:
    - "encoding monomorphic and polymorphic types"
    - "mizar 40 for mizar 40"
    - "premise selection for mathematics by corpus analysis and kernel methods"
    - "machine learner for automated reasoning 0 4 and 0 5"
    - "blistr the blind strategymaker"
    - "hol y hammer online atp service for hol light"
    - "theorem proving in large formal mathematics as an emerging ai field"
    - "learning assisted automated reasoning with flyspeck"

Connected through hyperedge HE-5 (induced by source paper "learning assisted theorem proving with millions of lemmas"):
  with members:
    - "mizar 40 for mizar 40"
    - "premise selection for mathematics by corpus analysis and kernel methods"
    - "machine learner for automated reasoning 0 4 and 0 5"
    - "lemma mining over hol light"
    - "blistr the blind strategymaker"
    - "hol y hammer online atp service for hol light"
    - "theorem proving in large formal mathematics as an emerging ai field"
    - "learning assisted automated reasoning with flyspeck"

Connected through hyperedge HE-6 (induced by source paper "certified connection tableaux proofs for hol light and tptp"):
  with members:
    - "premise selection and external provers for hol4"
    - "mizar 40 for mizar 40"
    - "learning assisted theorem proving with millions of lemmas"
    - "machine learning of coq proof guidance first experiments"
    - "premise selection for mathematics by corpus analysis and kernel methods"
    - "hol y hammer online atp service for hol light"
    - "theorem proving in large formal mathematics as an emerging ai field"
    - "learning assisted automated reasoning with flyspeck"

Connected through hyperedge HE-7 (induced by source paper "premise selection for mathematics by corpus analysis and kernel methods"):
  with members:
    - "dependencies in formal mathematics applications and extraction for coq and mizar"
    - "dependencies in formal mathematics applications and extraction for coq and mizar"
    - "large formal wikis issues and solutions"
    - "automated reasoning and presentation support for formalizing mathematics in mizar"

Connected through hyperedge HE-8 (induced by source paper "machine learner for automated reasoning 0 4 and 0 5"):
  with members:
    - "premise selection for mathematics by corpus analysis and kernel methods"
    - "blistr the blind strategymaker"
    - "hol y hammer online atp service for hol light"
    - "learning assisted automated reasoning with flyspeck"

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.DL(Digital Libraries)