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: "interoperability in the opendreamkit project the math in the middle approach"
  Abstract: OpenDreamKit – “Open Digital Research Environment Toolkit for the Advancement of Mathematics” – is an H2020 EU Research Infrastructure project that aims at supporting, over the period 2015–2019, the ecosystem of open-source mathematical software systems. OpenDreamKit will deliver a flexible toolkit enabling research groups to set up Virtual Research Environments, customised to meet the varied needs of research projects in pure mathematics and applications.

Connected through hyperedge HE-1 (induced by source paper "improving the representation and conversion of mathematical formulae by considering their textual context"):
  with members:
    - "vmext a visualization tool for mathematical expression trees"
    - "growing the digital repository of mathematical formulae with generic latex sources"
    - "digital repository of mathematical formulae"
    - "mathoid robust scalable fast and accessible math rendering for wikipedia"
    - "branch cuts in maple 17"
    - "rted a robust algorithm for the tree edit distance"

Connected through hyperedge HE-2 (induced by source paper "ontomath digital ecosystem ontologies mathematical knowledge analytics and management"):
  with members:
    - "ontomath pro ontology a linked data hub for mathematics"
    - "mathematical knowledge representation semantic models and formalisms"
    - "math net ru as a digital archive of the russian mathematical knowledge from the xix century to today"
    - "digital mathematics libraries the good the bad the ugly"
    - "digital ecosystems evolving service oriented architectures"

Connected through hyperedge HE-3 (induced by source paper "alignment based translations across formal systems using interface theories"):
  with members:
    - "matching concepts across hol libraries"
    - "realms a structure for consolidating knowledge about mathematical theories"
    - "a query language for formal mathematical libraries"
    - "a foundational view on integration problems"
    - "a scalable module system"

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.MS(Mathematical Software)